library

Prolog files

aggregate.pl  -- Aggregation operators on backtrackable predicates
aggregate/3	Aggregate bindings in Goal according to Template.
aggregate/4	Aggregate bindings in Goal according to Template.
aggregate_all/3	Aggregate bindings in Goal according to Template.
aggregate_all/4	Aggregate bindings in Goal according to Template.
foreach/2	True if conjunction of results is true.
free_variables/4	Find free variables in bagof/setof template.
safe_meta/2	Declare the aggregate meta-calls safe.
ansi_term.pl  -- Print decorated text to ANSI consoles
ansi_format/3	Format text with ANSI attributes.
message_line_element/2	Hook implementation that deals with ansi(+Attr, +Fmt, +Args) in message specifications.
apply.pl
apply_macros.pl  -- Goal expansion rules to avoid meta-calling
expand_phrase/2	Provide goal-expansion for PhraseGoal.
archive.pl  -- Access several archive formats
archive_close/1	Close the archive.
archive_create/3	Convenience predicate to create an archive in OutputFile with data from a list of InputFiles and the given Options.
archive_data_stream/3	True when DataStream is a stream to a data object inside Archive.
archive_entries/2	True when Paths is a list of pathnames appearing in Archive.
archive_extract/3	Extract files from the given archive into Dir.
archive_header_property/2	True when Property is a property of the current header.
archive_next_header/2	Forward to the next entry of the archive for which Name unifies with the pathname of the entry.
archive_open/3	Wrapper around archive_open/4 that opens the archive in read mode.
archive_open/4	Open the archive in Data and unify Archive with a handle to the opened archive.
archive_open_entry/2	Open the current entry as a stream.
archive_property/2	True when Property is a property of the archive Handle.
archive_set_header_property/2	Set Property of the current header.
arithmetic.pl  -- Extensible arithmetic
arithmetic_expression_value/2	True when Result unifies with the arithmetic result of evaluating Expression.
arithmetic_function/1	Declare a predicate as an arithmetic function.
assoc.pl  -- Binary associations
assoc_to_keys/2	True if Keys is the list of keys in Assoc.
assoc_to_list/2	Translate Assoc to a list Pairs of Key-Value pairs.
assoc_to_values/2	True if Values is the list of values in Assoc.
del_assoc/4	True if Key-Value is in Assoc0.
del_max_assoc/4	True if Key-Value is in Assoc0 and Key is the greatest key.
del_min_assoc/4	True if Key-Value is in Assoc0 and Key is the smallest key.
empty_assoc/1	Is true if Assoc is the empty association list.
gen_assoc/3	True if Key-Value is an association in Assoc.
get_assoc/3	True if Key-Value is an association in Assoc.
get_assoc/5	True if Key-Val0 is in Assoc0 and Key-Val is in Assoc.
is_assoc/1	True if Assoc is an association list.
list_to_assoc/2	Create an association from a list Pairs of Key-Value pairs.
map_assoc/2	True if Pred(Value) is true for all values in Assoc.
map_assoc/3	Map corresponding values.
max_assoc/3	True if Key-Value is in Assoc and Key is the largest key.
min_assoc/3	True if Key-Value is in assoc and Key is the smallest key.
ord_list_to_assoc/2	Assoc is created from an ordered list Pairs of Key-Value pairs.
put_assoc/4	Assoc is Assoc0, except that Key is associated with Value.
backcomp.pl  -- Backward compatibility
$apropos_match/2	True if Needle is a sub atom of Haystack.
$arch/2
$argv/1
$declare_module/3	Used in triple20 particle library.
$home/1
$module/2
$set_prompt/1	Set the prompt for the toplevel.
$strip_module/3	This used to be an internal predicate.
$version/1
C/3	Used to be generated by DCG.
at_initialization/1	Register goal only to be run if a saved state is restored.
checklist/2
concat/3
concat_atom/2	Concatenate a list of atomic values to an atom.
concat_atom/3	Concatenate a list of atomic values to an atom, inserting Seperator between each consecutive elements.
convert_time/2	Convert a time-stamp as obtained though get_time/1 into a textual representation using the C-library function ctime().
convert_time/8	Convert a time stamp, provided by get_time/1, time_file/2, etc.
current_module/2	True if Module is a module loaded from File.
current_mutex/3
current_thread/2
eval_license/0
export_list/2	Module exports the predicates of List.
flush/0
free_variables/2	Return a list of unbound variables in Term.
hash/1	Demands PredInd to be indexed using a hash-table.
hash_term/2	If Term is ground, Hash is unified to an integer representing a hash for Term.
index/1	Prepare the predicate indicated by Head for multi-argument indexing.
merge/3	Merge the ordered sets List1 and List2 into a new ordered list.
merge_set/3	Merge the ordered sets Set1 and Set2 into a new ordered set without duplicates.
message_queue_size/2	True if Queue holds Size terms.
proper_list/1	Old SWI-Prolog predicate to check for a list that really ends in a [].
read_clause/1
read_clause/2
read_pending_input/3
set_base_module/1	Set the default module from whic we inherit.
setup_and_call_cleanup/3	Call Cleanup once after Goal is finished.
setup_and_call_cleanup/4	Call Cleanup once after Goal is finished, with Catcher unified to the reason.
string_to_atom/2	Bi-directional conversion between string and atom.
string_to_list/2	Bi-directional conversion between a string and a list of character codes.
sublist/3	Succeeds if List2 unifies with a list holding those terms for wich call(Goal, Elem) succeeds.
substring/4	Predecessor of sub_string using 1-based Offset.
subsumes/2	True if Generic is unified to Specific without changing Specific.
subsumes_chk/2	True if Generic can be made equivalent to Specific without changing Specific.
sumlist/2	True when Sum is the list of all numbers in List.
trie_insert_new/3
write_ln/1
displayq/1	Write term ignoring operators and quote atoms.
feature/2	Control Prolog flags.
lock_predicate/2
read_variables/2
sformat/3
base32.pl  -- Base32 encoding and decoding
base32/2	Translates between plaintext and base32 encoded atom or string.
base32//1	Encode/decode list of character codes using base32.
base64.pl  -- Base64 encoding and decoding
base64/2	Translates between plaintext and base64 encoded atom or string.
base64_encoded/3	General the base64 encoding and decoding.
base64url/2	Translates between plaintext and base64url encoded atom or string.
base64//1	Encode/decode list of character codes using base64.
base64_encoded//2
base64url//1	Encode/decode list of character codes using Base64URL.
broadcast.pl  -- Event service
broadcast/1	Broadcast given event.
broadcast_request/1	Broadcast given event till accepted.
listening/3	returns currently open channels.
listen/3	Open a channel for listening for events of the given `Templ'.
unlisten/1	Destroy a channel.
c14n2.pl  -- C14n2 canonical XML documents
xml_write_canonical/3	Write an XML DOM using the canonical conventions as defined by C14n2.
charsio.pl  -- I/O on Lists of Character Codes
atom_to_chars/2	Convert Atom into a list of character codes.
atom_to_chars/3	Convert Atom into a difference list of character codes.
format_to_chars/3	Use format/2 to write to a list of character codes.
format_to_chars/4	Use format/2 to write to a difference list of character codes.
number_to_chars/2	Convert Atom into a list of character codes.
number_to_chars/3	Convert Number into a difference list of character codes.
open_chars_stream/2	Open Codes as an input stream.
read_from_chars/2	Read Codes into Term.
read_term_from_chars/3	Read Codes into Term.
with_output_to_chars/2	Run Goal as with once/1.
with_output_to_chars/3	Run Goal as with once/1.
with_output_to_chars/4	Same as with_output_to_chars/3 using an explicit stream.
write_to_chars/2	Write a term to a code list.
write_to_chars/3	Write a term to a code list.
console_input.pl
complete_input/4	Compute auto completions for the input line BeforeCursor+AfterCursor.
crypt.pl
crypto.pl  -- Cryptography and authentication library
crypto_context_hash/2	Obtain the hash code of Context.
crypto_context_new/2	Context is unified with the empty context, taking into account Options.
crypto_curve_generator/2	Point is the generator of the elliptic curve Curve.
crypto_curve_order/2	Obtain the order of an elliptic curve.
crypto_curve_scalar_mult/4	R is the result of N times Point on the elliptic curve Curve.
crypto_data_context/3	Context0 is an existing computation context, and Context is the new context after hashing Data in addition to the previously hashed data.
crypto_data_decrypt/6	Decrypt the given CipherText, using the symmetric algorithm Algorithm, key Key, and initialization vector IV, to give PlainText.
crypto_data_encrypt/6	Encrypt the given PlainText, using the symmetric algorithm Algorithm, key Key, and initialization vector (or nonce) IV, to give CipherText.
crypto_data_hash/3	Hash is the hash of Data.
crypto_data_hkdf/4	Concentrate possibly dispersed entropy of Data and then expand it to the desired length.
crypto_file_hash/3	True if Hash is the hash of the content of File.
crypto_generate_prime/3	Generate a prime P with at least N bits.
crypto_is_prime/2	True iff P passes a probabilistic primality test.
crypto_modular_inverse/3	Compute the modular multiplicative inverse of the integer X.
crypto_n_random_bytes/2	Bytes is unified with a list of N cryptographically secure pseudo-random bytes.
crypto_name_curve/2	Obtain a handle for a named elliptic curve.
crypto_open_hash_stream/3	Open a filter stream on OrgStream that maintains a hash.
crypto_password_hash/2	If Hash is instantiated, the predicate succeeds iff the hash matches the given password.
crypto_password_hash/3	Derive Hash based on Password.
crypto_stream_hash/2	Unify Hash with a hash for the bytes sent to or read from HashStream.
ecdsa_sign/4	Create an ECDSA signature for Data with EC private key Key.
ecdsa_verify/4	True iff Signature can be verified as the ECDSA signature for Data, using the EC public key Key.
hex_bytes/2	Relation between a hexadecimal sequence and a list of bytes.
rsa_sign/4	Create an RSA signature for Data with private key Key.
rsa_verify/4	Verify an RSA signature for Data with public key Key.
rsa_private_decrypt/4	RSA Public key encryption and decryption primitives.
csv.pl  -- Process CSV (Comma-Separated Values) data
csv_options/2	Compiled is the compiled representation of the CSV processing options as they may be passed into csv//2, etc.
csv_read_file_row/3	True when Row is a row in File.
csv_read_row/3	Read the next CSV record from Stream and unify the result with Row.
csv_write_stream/3	Write the rows in Data to Stream.
csv_read_file/2	Read a CSV file into a list of rows.
csv_write_file/2	Write a list of Prolog terms to a CSV file.
csv//1	Prolog DCG to `read/write' CSV data.
ctypes.pl  -- Character code classification
is_digit/3	Succeeds if `C' is a digit using `Base' as base and `Weight' represents its value.
is_paren/2	True if Open is the open-parenthesis of Close.
to_lower/2	Downcase a character code.
to_upper/2	Upcase a character code.
upper_lower/2	True when U is the character code of an uppercase character and L is the character code of the corresponding lowercase character.
date.pl  -- Process dates and times
date_time_value/3	Extract values from a date-time structure.
day_of_the_week/2	Computes the day of the week for a given date.
day_of_the_year/2	Computes the day of the year for a given date.
parse_time/2	Stamp is a timestamp created from parsing Text using the representation Format.
debug.pl  -- Print debug messages and test assertions
assertion_failed/2	This hook is called if the Goal of assertion/1 fails.
debug_print_hook/3	Hook called by debug/3.
assertion/1	Acts similar to C assert() macro.
debug/3	Format a message if debug topic is enabled.
debug_message_context/1	Specify additional context for debug messages.
list_debug_topics/0	List currently known debug topics and their setting.
debug/1	Add/remove a topic from being printed.
debugging/1	Examine debug topics.
dialect.pl  -- Support multiple Prolog dialects
exists_source/1	True if Source (a term valid for load_files/2) exists.
expects_dialect/1	Tell Prolog all subsequent code to the end of the file or the next :- expects_dialect/1 directive is written for the indicated Dialect.
source_exports/2	True if Source exports Export.
dicts.pl  -- Dict utilities
dict_fill/4	Implementation for the dicts_to_same_keys/3 OnEmpty closure that fills new cells with a copy of ValueIn.
dict_keys/2	True when Keys is an ordered set of the keys appearing in Dict.
dicts_join/3	Join dicts in Dicts that have the same value for Key, provided they do not have conflicting values on other keys.
dicts_join/4	Join two lists of dicts (Dicts1 and Dicts2) on Key.
dicts_same_keys/2	True if List is a list of dicts that all have the same keys and Keys is an ordered set of these keys.
dicts_same_tag/2	True when List is a list of dicts that all have the tag Tag.
dicts_slice/3	DictsOut is a list of Dicts only containing values for Keys.
dicts_to_compounds/4	True when Dicts and Compounds are lists of the same length and each element of Compounds is a compound term whose arguments represent the values associated with the corresponding keys in Keys.
dicts_to_same_keys/3	DictsOut is a copy of DictsIn, where each dict contains all keys appearing in all dicts of DictsIn.
dif.pl  -- The dif/2 constraint
dif/2	Constraint that expresses that Term1 and Term2 never become identical (==/2).
doc_http.pl  -- Documentation server
doc_enable/1	Actually activate the PlDoc server.
doc_browser/0	Open user's default browser on the documentation server.
doc_server/1	Start a documentation server in the current Prolog process.
double_metaphone.pl  -- Phonetic string matching
double_metaphone/2	Same as double_metaphone/3, but only returning the primary metaphone.
double_metaphone/3	Create metaphone and alternative metaphone from In.
editline.pl  -- BSD libedit based command line editing
el_add_history/2	Add a line to the command line history.
el_addfn/4	Add a new command to the command line editor associated with Input.
el_bind/2	Invoke the libedit bind command with the given arguments.
el_cursor/2	Move the cursor Move character forwards (positive) or backwards (negative).
el_deletestr/2	Delete Count characters before the cursor.
el_history/2	Perform a generic action on the history.
el_history_events/2	Unify Events with a list of pairs of the form Num-String, where Num is the event number and String is the associated string without terminating newline.
el_insertstr/2	Insert Text at the cursor.
el_line/2	Fetch the currently buffered input line.
el_read_history/2	Read the history saved using el_write_history/2.
el_setup/1	This hooks is called as forall(el_setup(Input), true) after the input stream has been wrapped, the default Prolog commands have been added and the default user setup file has been sourced using el_source/2.
el_source/2	Initialise editline by reading the contents of File.
el_unwrap/1	Remove the libedit wrapper for In and the related output and error streams.
el_wrap/0	Enable using editline on the standard user streams if user_input is connected to a terminal.
el_wrap/4	Enable editline on the stream-triple <In,Out,Error>.
el_wrapped/1	True if In is a stream wrapped by el_wrap/3.
el_write_history/2	Save editline history to File.
error.pl  -- Error generating support
type_error/2	Tell the user that Term is not of the expected Type.
filesex.pl  -- Extended operations on files
chmod/2	Set the mode of the target file.
copy_directory/2	Copy the contents of the directory From to To (recursively).
copy_file/2	Copy a file into a new file or directory.
delete_directory_and_contents/1	Recursively remove the directory Dir and its contents.
delete_directory_contents/1	Remove all content from directory Dir, without removing Dir itself.
directory_file_path/3	True when Path is the full path-name for File in Dir.
link_file/3	Create a link in the filesystem from NewPath to OldPath.
make_directory_path/1	Create Dir and all required components (like mkdir -p).
relative_file_name/3	True when RelPath is Path, relative to RelTo.
set_time_file/3	Query and set POSIX time attributes of a file.
gensym.pl  -- Generate unique symbols
gensym/2	Generate <Base>1, <Base>2, etc atoms on each subsequent call.
reset_gensym/0	Reset all gensym counters.
reset_gensym/1	Reset a specific gensym counter.
git.pl  -- Run GIT commands
git/2	Run a GIT command.
git_branches/2	True when Branches is the list of branches in the repository.
git_default_branch/2	True when BranchName is the default branch of a repository.
git_describe/2	Describe the running version based on GIT tags and hashes.
git_hash/2	Return the hash of the indicated object.
git_ls_remote/3	Execute git ls-remote against the remote repository to fetch references from the remote.
git_ls_tree/2	True when Entries is a list of entries in the the GIT repository, Each entry is a term:.
git_open_file/4	Open the file File in the given bare GIT repository on the given branch (treeisch).
git_process_output/3	Run a git-command and process the output with OnOutput, which is called as call(OnOutput, Stream).
git_remote_branches/2	Exploit git_ls_remote/3 to fetch the branches from a remote repository without downloading it.
git_remote_url/3	URL is the remote (fetch) URL for the given Remote.
git_shortlog/3	Fetch information like the GitWeb change overview.
git_show/4	Fetch info from a GIT commit.
git_tags_on_branch/3	Tags is a list of tags in Branch on the GIT repository Dir, most recent tag first.
is_git_directory/1	True if Directory is a git directory (Either checked out or bare).
iostream.pl  -- Utilities to deal with streams
close_any/1	Execute the Close closure returned by open_any/5.
open_any/5	Establish a stream from Specification that should be closed using Close, which can either be called or passed to close_any/1.
open_hook/6	Open Spec in Mode, producing Stream.
listing.pl  -- List programs and pretty print clauses
listing/0	Lists all predicates defined in the calling module.
listing/1	List matching clauses.
portray_clause/1	Portray `Clause' on the current output stream.
lists.pl
memfile.pl
modules.pl  -- Module utility predicates
in_temporary_module/3	Run Goal on temporary loaded sources and discard the module and loaded predicates after completion.
nb_set.pl  -- Non-backtrackable sets
empty_nb_set/1	Create an empty non-backtrackable set.
gen_nb_set/2	Enumerate the members of a set in the standard order of terms.
nb_set_to_list/2	Get the elements of a an nb_set.
size_nb_set/2	Unify Size with the number of elements in the set.
add_nb_set/2	Insert Key into the set.
occurs.pl  -- Finding and counting sub-terms
contains_term/2	Succeeds if Sub is contained in Term (=, deterministically).
contains_var/2	Succeeds if Sub is contained in Term (==, deterministically).
free_of_term/2	Succeeds of Sub does not unify to any subterm of Term.
free_of_var/2	Succeeds of Sub is not equal (==) to any subterm of Term.
occurrences_of_term/3	Count the number of SubTerms in Term.
occurrences_of_var/3	Count the number of SubTerms in Term.
sub_term/2	Generates (on backtracking) all subterms of Term.
sub_var/2	Generates (on backtracking) all subterms (==) of Term.
operators.pl  -- Manage operators
pop_operators/0	Revert all changes to the operator table realised since the last push_operators/1.
pop_operators/1	Reset operators as pushed by push_operators/2.
push_op/3	As op/3, but this call must appear between push_operators/1 and pop_operators/0.
push_operators/1	Installs the operators from New, where New is a list of op(Prec, Type, :Name).
option.pl  -- Option list processing
dict_options/2	Convert between an option list and a dictionary.
merge_options/3	Merge two option lists.
meta_options/3	Perform meta-expansion on options that are module-sensitive.
option/2	Get an Option from OptionList.
option/3	Get an Option from OptionList.
select_option/3	Get and remove Option from an option list.
select_option/4	Get and remove Option with default value.
ordsets.pl  -- Ordered set manipulation
is_ordset/1	True if Term is an ordered set.
list_to_ord_set/2	Transform a list into an ordered set.
ord_add_element/3	Insert an element into the set.
ord_del_element/3	Delete an element from an ordered set.
ord_disjoint/2	True if Set1 and Set2 have no common elements.
ord_empty/1	True when List is the empty ordered set.
ord_intersect/2	True if both ordered sets have a non-empty intersection.
ord_intersect/3	Intersection holds the common elements of Set1 and Set2.
ord_intersection/2	Intersection of a powerset.
ord_intersection/3	Intersection holds the common elements of Set1 and Set2.
ord_intersection/4	Intersection and difference between two ordered sets.
ord_memberchk/2	True if Element is a member of OrdSet, compared using ==.
ord_selectchk/3	Selectchk/3, specialised for ordered sets.
ord_seteq/2	True if Set1 and Set2 have the same elements.
ord_subset/2	Is true if all elements of Sub are in Super.
ord_subtract/3	Diff is the set holding all elements of InOSet that are not in NotInOSet.
ord_symdiff/3	Is true when Difference is the symmetric difference of Set1 and Set2.
ord_union/2	True if Union is the union of all elements in the superset SetOfSets.
ord_union/3	Union is the union of Set1 and Set2.
ord_union/4	True iff ord_union(Set1, Set2, Union) and ord_subtract(Set2, Set1, New).
oset.pl  -- Ordered set manipulation
oset_addel/3	ordered set element addition.
oset_delel/3	ordered set element deletion.
oset_diff/3	ordered set difference.
oset_dint/2	distributed intersection.
oset_dunion/2	distributed union.
oset_int/3	ordered set intersection.
oset_is/1	check that OSet in correct format (standard order).
oset_power/2	True when PSet is the powerset of Set.
oset_union/3
pairs.pl
pcre.pl  -- Perl compatible regular expression matching for SWI-Prolog
re_compile/3	Compiles Pattern to a Regex blob of type regex (see blob/2).
re_config/1	Extract configuration information from the pcre library.
re_flush/0	Clean pattern and replacement caches.
re_foldl/6	Fold all matches of Regex on String.
re_matchsub/4	Match String against Regex.
re_replace/4	Replace matches of the regular expression Pattern in String with With.
re_match/2	Succeeds if String matches Regex.
re_split/3	Split String using the regular expression Pattern.
pengines.pl  -- Pengines: Web Logic Programming Made Easy
authentication_hook/3	This hook is called from the =/pengine/create= HTTP handler to discover whether the server is accessed by an authorized user.
current_pengine_application/1	True when Application is a currently defined application.
event_to_json/3	Hook that translates a Pengine event structure into a term suitable for reply_json/1, according to the language specification Lang.
not_sandboxed/2	This hook is called to see whether the Pengine must be executed in a protected environment.
output/2	Hook to handle pengine_output/1 from the remote pengine.
pengine_abort/1	Aborts the running query.
pengine_application/1	Directive that must be used to declare a pengine application module.
pengine_ask/3	Asks pengine NameOrID a query Query.
pengine_create/1	Creates a new pengine.
pengine_debug/2	Create a message using format/3 from Format and Args and send this to the client.
pengine_event_loop/2	Starts an event loop accepting event terms sent to the current pengine or thread.
pengine_input/2	Sends Prompt to the parent pengine and waits for input.
pengine_next/2	Asks pengine NameOrID for the next solution to a query started by pengine_ask/3.
pengine_output/1	Sends Term to the parent pengine or thread.
pengine_property/2	True when Property is a property of the given Pengine.
pengine_pull_response/2	Pulls a response (an event term) from the slave Pengine if Pengine is a remote process, else does nothing at all.
pengine_respond/3	Sends a response in the form of the term Input to a slave pengine that has prompted its master for input.
pengine_self/1	True if the current thread is a pengine with Id.
pengine_stop/2	Tells pengine NameOrID to stop looking for more solutions to a query started by pengine_ask/3.
pengine_user/1	True when the pengine was create by an HTTP request that authorized User.
prepare_goal/3	Pre-preparation hook for running Goal0.
prepare_module/3	Hook, called to initialize the temporary private module that provides the working context of a pengine.
prompt/3	Hook to handle pengine_input/2 from the remote pengine.
write_result/3	Hook that allows for different output formats.
create_pool/1	On demand creation of a thread pool for a pengine application.
pengine_destroy/1	Destroys the pengine NameOrID.
pengine_rpc/2	Semantically equivalent to the sequence below, except that the query is executed in (and in the Prolog context of) the pengine server referred to by URL, rather than locally.
persistency.pl  -- Provide persistent dynamic predicates
current_persistent_predicate/1	True if PI is a predicate that provides access to the persistent database DB.
db_attach/2	Use File as persistent database for the calling module.
db_attached/1	True if the context module attached to the persistent database File.
db_detach/0	Detach persistency from the calling module and delete all persistent clauses from the Prolog database.
db_sync/1	Synchronise database with the associated file.
db_sync_all/1	Sync all registered databases.
persistent/1	Declare dynamic database terms.
pldoc.pl  -- Process source documentation
doc_collect/1	Switch collecting comments true/false.
pldoc_loading/0	True if we are loading the PlDoc libraries.
tag_order/2	Hook that allows for defining additional tags.
porter_stem.pl
predicate_options.pl  -- Access and analyse predicate options
assert_predicate_options/4	As predicate_options(:PI, +Arg, +Options).
check_predicate_option/3	Verify predicate options at runtime.
check_predicate_options/0	Analyse loaded program for erroneous options.
check_predicate_options/1	Verify calls to predicates that have options in all clauses of the predicate indicated by PredicateIndicator.
current_option_arg/2	True when Arg of PI processes predicate options.
current_predicate_option/3	True when Arg of PI processes Option.
current_predicate_options/3	True when Options is the current active option declaration for PI on Arg.
derive_predicate_options/0	Derive new predicate option declarations.
derived_predicate_options/1	Derive predicate option declarations for a module.
derived_predicate_options/3	Derive option arguments using static analysis.
predicate_options/3	Declare that the predicate PI processes options on Arg.
retractall_predicate_options/0	Remove all dynamically (derived) predicate options.
process.pl  -- Create processes and redirect I/O
is_process/1	True if PID might be a process.
process_create/3	Create a new process running the file Exe and using arguments from the given list.
process_id/1	True if PID is the process id of the running Prolog process.
process_id/2	PID is the process id of Process.
process_release/1	Release process handle.
process_group_kill/1	Send signal to the group containing process PID.
process_kill/1	Send signal to process PID.
process_wait/2	True if PID completed with Status.
prolog_clause.pl  -- Get detailed source-information about a clause
clause_name/2	Provide a suitable description of the indicated clause.
initialization_layout/4	Find term-layout of :- initialization directives.
open_source/2	Hook into clause_info/5 that opens the stream holding the source for a specific clause.
predicate_name/2	Describe a predicate as [Module:]Name/Arity.
unify_goal/5	This hook is called to fix up source code manipulations that result from goal expansions.
clause_info/4	Fetches source information for the given clause.
prolog_colour.pl  -- Prolog syntax colouring support.
goal_classification/2	Multifile hookable classification for non-local goals.
prolog_colourise_query/3	Colourise a query, to be executed in the context of SourceId.
prolog_colourise_stream/3	Determine colour fragments for the data on Stream.
prolog_colourise_term/4	Colourise the next term on Stream.
syntax_colour/2	True when a range classified Class must be coloured using Attributes.
vararg_goal_classification/3	Multifile hookable classification for vararg predicates.
prolog_format.pl  -- Analyse format specifications
format_spec/2	Parse a format string.
format_types/2	True when Format requires an argument list with terms of the type specified by Types.
format_spec//1	DCG for parsing format strings.
prolog_history.pl  -- Per-directory persistent commandline history
prolog_history/1	Execute Action on the history.
prolog_pack.pl  -- A package manager for Prolog
environment/2	Hook to define the environment for building packs.
pack_info/1	Print more detailed information about Pack.
pack_install/1	Install a package.
pack_install/2	Install package Name.
pack_list_installed/0	List currently installed packages.
pack_property/2	True when Property is a property of an installed Pack.
pack_rebuild/0	Rebuild foreign components of all packages.
pack_rebuild/1	Rebuilt possible foreign components of Pack.
pack_remove/1	Remove the indicated package.
pack_upgrade/1	Try to upgrade the package Pack.
pack_url_file/2	True if File is a unique id for the referenced pack and version.
pack_search/1	Query package server and installed packages and display results.
prolog_source.pl  -- Examine Prolog source-files
quasi_quotation_syntax/2	True when the quasi quotation syntax Syntax can be loaded from Library.
xref_close_source/2	Called by prolog_close_source/1 to close a source previously opened by the hook prolog:xref_open_source/2.
xref_open_source/2	Hook to open an xref SourceID.
directory_source_files/3	True when Files is a sorted list of Prolog source files in Dir.
file_alias_path/2	True if file Alias points to Dir.
file_name_on_path/2	True if OnPath a description of File based on the file search path.
load_quasi_quotation_syntax/2	Import quasi quotation syntax Syntax from Path into the module specified by the first argument.
path_segments_atom/2	Translate between a path represented as a/b/c and an atom representing the same path.
prolog_canonical_source/2	Given a user-specification of a source, generate a unique and indexable identifier for it.
prolog_close_source/1	Close a stream opened using prolog_open_source/2.
prolog_open_source/2	Open source with given canonical id (see prolog_canonical_source/2) and remove the #!
prolog_read_source_term/4	Read a term from a Prolog source-file.
read_source_term_at_location/3	Try to read a Prolog term form an arbitrary location inside a file.
requires_library/2	known expansion hooks.
prolog_stack.pl  -- Examine the Prolog stack
backtrace/1	Get and print a stacktrace to the user_error stream.
prolog_stack_frame_property/2	True when Property is a property of Frame.
stack_guard/1	Dynamic multifile hook that is normally not defined.
stack_guard/1	Dynamic multifile predicate.
get_prolog_backtrace/2	Obtain a backtrace from the current location.
print_prolog_backtrace/2	Print a stacktrace in human readable form to Stream.
prolog_xref.pl  -- Prolog cross-referencer data collection
called_by/2	If this succeeds, the cross-referencer assumes Goal may call any of the goals in ListOfCalled.
called_by/4	True when Called is a list of callable terms called from Goal, handled by the predicate Module:Goal and executed in the context of the module Context.
hook/1	True if Goal is a hook that is called spontaneously (e.g., from foreign code).
meta_goal/2	Define meta-predicates.
xref_clean/1	Reset the database for the given source.
xref_comment/3	Is true when Source has a section comment with Title and Comment.
xref_comment/4	Is true when Head in Source has the given PlDoc comment.
xref_current_source/1	Check what sources have been analysed.
xref_defined/3	Test if Goal is accessible in Source.
xref_definition_line/2	If the 3th argument of xref_defined contains line info, return this in Line.
xref_done/2	Cross-reference executed at Time.
xref_exported/2	True when Source exports Head.
xref_hook/1	Definition of known hooks.
xref_meta/3	True when Head calls Called in Source.
xref_mode/3	Is true when Source provides a predicate with Mode and determinism.
xref_module/2	True if Module is defined in Source.
xref_op/2	Give the operators active inside the module.
xref_option/2	True when Source was processed using Option.
xref_prolog_flag/4	True when Flag is set to Value at Line in Source.
xref_public_list/3	Find meta-information about File.
xref_uses_file/3	True when Source tries to load a file using Spec.
xref_called/3	Enumerate the predicate-call relations.
xref_meta/2	True when Called is a list of terms called from Head.
xref_public_list/4	Find meta-information about File.
xref_source/1	Generate the cross-reference data for Source if not already done and the source is not modified.
xref_source_file/3	Find named source file from Spec, relative to Src.
pure_input.pl  -- Pure Input from files and streams
phrase_from_file/2	Process the content of File using the DCG rule Grammar.
phrase_from_file/3	As phrase_from_file/2, providing additional Options.
phrase_from_stream/2	Run Grammer against the character codes on Stream.
stream_to_lazy_list/2	Create a lazy list representing the character codes in Stream.
lazy_list_character_count//1	True when CharCount is the current character count in the Lazy list.
lazy_list_location//1	Determine current (error) location in a lazy list.
syntax_error//1	Throw the syntax error Error at the current location of the input.
quasi_quotations.pl  -- Define Quasi Quotation syntax
phrase_from_quasi_quotation/2	Process the quasi quotation using the DCG Grammar.
quasi_quotation_syntax/1	Declare the predicate SyntaxName/4 to implement the the quasi quote syntax SyntaxName.
quasi_quotation_syntax_error/1	Report syntax_error(Error) using the current location in the quasi quoted input parser.
with_quasi_quotation_input/3	Process the quasi-quoted Content using Stream parsed by Goal.
quintus.pl  -- Quintus compatibility
abs/2	Unify `Absolute' with the absolute value of `Number'.
atom_char/2	Same as ISO char_code/2.
compile/1	Compile files.
current_stream/3	SICStus/Quintus and backward compatible predicate.
date/1	Get current date as date(Y,M,D).
genarg/3	Generalised version of ISO arg/3.
mode/1	Ignore a DEC10/Quintus :- mode(Head) declaration.
no_style_check/1	Same as SWI-Prolog style_check(-Style).
on_exception/3
otherwise/0	For (A -> B ; otherwise -> C).
prolog_flag/2	Same as ISO current_prolog_flag/2.
raise_exception/1	Quintus compatible exception handling.
simple/1	Term is atomic or a variable.
stream_position/3	True when Old is the current position in Stream and the stream has been repositioned to New.
unix/1	interface to Unix.
midstring/3	Too difficult to explain.
sin/2	Math library predicates.
skip_line/0	Skip the rest of the current line (on Stream).
rbtrees.pl  -- Red black trees
is_rbtree/1	True if Term is a valide Red-Black tree.
list_to_rbtree/2	Tree is the red-black tree corresponding to the mapping in List, which should be a list of Key-Value pairs.
ord_list_to_rbtree/2	Tree is the red-black tree corresponding to the mapping in list List, which should be a list of Key-Value pairs.
rb_apply/4	If the value associated with key Key is Val0 in Tree, and if call(G,Val0,ValF) holds, then NewTree differs from Tree only in that Key is associated with value ValF in tree NewTree.
rb_clone/3	`Clone' the red-back tree TreeIn into a new tree TreeOut with the same keys as the original but with all values set to unbound values.
rb_del_max/4	Delete the largest element from the tree Tree, returning the key Key, the value Val associated with the key and a new tree NewTree.
rb_del_min/4	Delete the least element from the tree Tree, returning the key Key, the value Val associated with the key and a new tree NewTree.
rb_empty/1	Succeeds if Tree is an empty Red-Black tree.
rb_fold/4	Fold the given predicate over all the key-value pairs in Tree, starting with initial state State0 and returning the final state State.
rb_in/3	True when Key-Value is a key-value pair in red-black tree Tree.
rb_insert/4	Add an element with key Key and Value to the tree Tree creating a new red-black tree NewTree.
rb_insert_new/4	Add a new element with key Key and Value to the tree Tree creating a new red-black tree NewTree.
rb_keys/2	Keys is unified with an ordered list of all keys in the Red-Black tree Tree.
rb_lookup/3	True when Value is associated with Key in the Red-Black tree Tree.
rb_map/2	True if call(Goal, Value) is true for all nodes in T.
rb_map/3	For all nodes Key in the tree Tree, if the value associated with key Key is Val0 in tree Tree, and if call(G,Val0,ValF) holds, then the value associated with Key in NewTree is ValF.
rb_max/3	Key is the maximal key in Tree, and is associated with Val.
rb_min/3	Key is the minimum key in Tree, and is associated with Val.
rb_new/1	Create a new Red-Black tree Tree.
rb_next/4	Next is the next element after Key in Tree, and is associated with Val.
rb_partial_map/4	For all nodes Key in Keys, if the value associated with key Key is Val0 in tree Tree, and if call(G,Val0,ValF) holds, then the value associated with Key in NewTree is ValF.
rb_previous/4	Previous is the previous element after Key in Tree, and is associated with Val.
rb_size/2	Size is the number of elements in Tree.
rb_visit/2	Pairs is an infix visit of tree Tree, where each element of Pairs is of the form Key-Value.
rb_delete/3	Delete element with key Key from the tree Tree, returning the value Val associated with the key and a new tree NewTree.
rb_update/4	Tree NewTree is tree Tree, but with value for Key associated with NewVal.
rdf.pl
process_rdf/3	Process RDF from Input.
xml_to_rdf/3
load_rdf/2	Parse an XML file holding an RDF term into a list of RDF triples.
rdf_ntriples.pl  -- RDF N-triples parser (obsolete)
rdf_parser.pl
element_to_plrdf/3	Rewrite a single XML element.
rdf_name_space/1	True if URL must be handled as rdf: Determines special handling of rdf:about, rdf:resource, etc.
xml_to_plrdf/3	Translate an XML (using namespaces) term into an Prolog term representing the RDF data.
rdf_triple.pl  -- Create triples from intermediate representation
anon_prefix/1	If defined, it is the prefix used to generate a blank node.
rdf_end_file/1	Cleanup reaching the end of an RDF file.
rdf_reset_ids/0	Utility predicate to reset the gensym counters for the various generated identifiers.
rdf_start_file/2	Initialise for the translation of a file.
rdf_triples/2	Convert an object as parsed by rdf.pl into a list of rdf/3 triples.
rdf_write.pl  -- Write RDF/XML from a list of triples
rdf_write_xml/2	Write an RDF/XML serialization of Triples to Out.
readutil.pl  -- Read utilities
read_file_to_codes/3	Read the file Spec into a list of Codes.
read_file_to_string/3	Read the file Spec into a the string String.
read_file_to_terms/3	Read the file Spec into a list of terms.
read_line_to_codes/2	Read a line of input from In into a list of character codes.
read_line_to_codes/3	Read a line of input as a difference list.
read_line_to_string/2	Read the next line from Stream into String.
read_stream_to_codes/2	Read input from Stream to a list of character codes.
record.pl  -- Access compound arguments by name
current_record/2	True if Name is the name of a record defined in the module associated with Term and Term is the user-provided record declaration.
current_record_predicate/2	True if PI is the predicate indicator for an access predicate to Record.
record/1	Define access predicates for a compound-term.
rewrite.pl
rewrite/2	Invoke the term-rewriting system.
sandbox.pl  -- Sandboxed Prolog code
sandbox_allowed_directive/1	Throws an exception if G is not considered a safe directive.
sandbox_allowed_expansion/1	Throws an exception if G is not considered a safe expansion goal.
sandbox_allowed_goal/1	Throw an exception if it is not safe to call G.
safe_call/1	Call Goal if it complies with the sandboxing rules.
safe_directive/1	Hook to declare additional directives as safe.
safe_global_variable/1	Declare the given global variable safe to write to.
safe_goal/1	True if calling Goal provides no security risc.
safe_meta/2	Hook.
safe_primitive/1	True if Goal is safe to call (i.e., cannot access dangerous system-resources and cannot upset other parts of the Prolog process).
settings.pl  -- Setting management
convert_setting_text/3	Converts from textual form to Prolog Value.
current_setting/1	True if Setting is a currently defined setting.
restore_setting/1	Restore the value of setting Name to its default.
set_setting/2	Change a setting.
set_setting_default/2	Change the default for a setting.
setting/2	True when Name is a currently defined setting with Value.
setting/4	Define a setting.
setting_property/2	Query currently defined settings.
list_settings/0	List settings to current_output.
load_settings/1	Load local settings from File.
save_settings/0	Save modified settings to File.
sgml.pl  -- SGML, XML and HTML parser
dtd/2	DTD is a DTD object created from the file dtd(Type).
load_dtd/3	Load DtdFile into a DTD.
load_html/3	Load HTML text from Input and unify the resulting DOM structure with DOM.
load_html_file/2	Load HTML from File and unify the resulting DOM structure with DOM.
load_sgml/3	Load SGML text from Input and unify the resulting DOM structure with DOM.
load_sgml_file/2	Load SGML from File and unify the resulting DOM structure with DOM.
load_structure/3	Parse Source and return the resulting structure in ListOfContent.
load_xml/3	Load XML text from Input and unify the resulting DOM structure with DOM.
load_xml_file/2	Load XML from File and unify the resulting DOM structure with DOM.
xml_is_dom/1	True if term statisfies the structure as returned by load_structure/3 and friends.
xml_name/1	True if Atom is a valid XML name.
xml_basechar/1	XML character classification predicates.
xml_quote_attribute/2	Backward compatibility for versions that allow to specify encoding.
sgml_write.pl  -- XML/SGML writer module
xmlns/2	Hook to define human readable abbreviations for XML namespaces.
xml_write/2	Write a term as created by the SGML/XML parser to a stream in SGML or XML format.
sha.pl  -- SHA secure hashes
file_sha1/2	True when SHA1 is the SHA1 hash for the content of File.
hash_atom/2	Convert a list of bytes (integers 0..255) into the usual hexadecimal notation.
hmac_sha/4	For Options, see sha_hash/3.
sha_hash/3	Hash is the SHA hash of Data, The conversion is controlled by Options:.
sha_hash_ctx/4	Hash is the SHA hash of Data.
sha_new_ctx/2	NewContext is unified with the empty SHA computation context (which includes the Options.) It could later be passed to sha_hash_ctx/4.
shlib.pl  -- Utility library for loading foreign objects (DLLs, shared objects)
current_foreign_library/2	Query currently loaded shared libraries.
reload_foreign_libraries/0	Reload all foreign libraries loaded (after restore of a state created using qsave_program/2.
load_foreign_library/1	Load a shared object or DLL.
unload_foreign_library/1	Unload a shared object or DLL.
use_foreign_library/1	Load and install a foreign library as load_foreign_library/1,2 and register the installation using initialization/2 with the option now.
snowball.pl  -- The Snowball multi-lingual stemmer library
snowball/3	Apply the Snowball Algorithm on Input and unify the result (an atom) with Stem.
snowball_current_algorithm/1	True if Algorithm is the official name of an algorithm suported by snowball/3.
socket.pl  -- Network socket (TCP and UDP) library
gethostname/1	Return the canonical fully qualified name of this host.
negotiate_socks_connection/2	Negotiate a connection to DesiredEndpoint over StreamPair.
proxy_for_url/3	This hook can be implemented to return a proxy to try when connecting to URL.
tcp_accept/3	This predicate waits on a server socket for a connection request by a client.
tcp_bind/2	Bind the socket to Address on the current machine.
tcp_close_socket/1	Closes the indicated socket, making SocketId invalid.
tcp_connect/2	Connect SocketId.
tcp_connect/3	Establish a TCP communication as a client.
tcp_connect/4	Connect a (client) socket to Address and return a bi-directional connection through the stream-handles Read and Write.
tcp_fcntl/3	Interface to the fcntl() call.
tcp_host_to_address/2	Translate between a machines host-name and it's (IP-)address.
tcp_listen/2	Tells, after tcp_bind/2, the socket to listen for incoming requests for connections.
tcp_open_socket/2	Create streams to communicate to SocketId.
tcp_open_socket/3	Similar to tcp_open_socket/2, but creates two separate sockets where tcp_open_socket/2 would have created a stream pair.
tcp_select/3	Same as the built-in wait_for_input/3, but integrates better with event processing and the various options of sockets for Windows.
tcp_setopt/2	Set options on the socket.
tcp_socket/1	Creates an INET-domain stream-socket and unifies an identifier to it with SocketId.
try_proxy/4	Attempt a socket-level connection via the given proxy to TargetAddress.
solution_sequences.pl  -- Modify solution sequences
group_by/4	Group bindings of Template that have the same value for By.
limit/2	Limit the number of solutions.
offset/2	Ignore the first Count solutions.
order_by/2	Order solutions according to Spec.
distinct/1	True if Goal is true and no previous solution of Goal bound Witness to the same value.
reduced/1	Similar to distinct/1, but does not guarantee unique results in return for using a limited amount of memory.
ssl.pl  -- Secure Socket Layer (SSL) library
cert_accept_any/5	Implementation for the hook `cert_verify_hook(:Hook)` that accepts any certificate.
load_certificate/2	Loads a certificate from a PEM- or DER-encoded stream, returning a term which will unify with the same certificate if presented in cert_verify_hook.
load_crl/2	Loads a CRL from a PEM- or DER-encoded stream, returning a term containing terms hash/1, signature/1, issuer_name/1 and revocations/1, which is a list of revoked/2 terms.
load_private_key/3	Load a private key PrivateKey from the given stream Stream, using Password to decrypt the key if it is encrypted.
load_public_key/2	Load a public key PublicKey from the given stream Stream.
ssl_add_certificate_key/4	Add an additional certificate/key pair to SSL0, yielding SSL.
ssl_context/3	Create an SSL context.
ssl_negotiate/5	Once a connection is established and a read/write stream pair is available, (PlainRead and PlainWrite), this predicate can be called to negotiate an SSL session over the streams.
ssl_peer_certificate/2	True if the peer certificate is provided (this is always the case for a client connection) and Certificate unifies with the peer certificate.
ssl_peer_certificate_chain/2	Certificates is the certificate chain provided by the peer, represented as a list of certificates.
ssl_secure_ciphers/1	Secure ciphers must guarantee forward secrecy, and must mitigate all known critical attacks.
ssl_session/2	Retrieves (debugging) properties from the SSL context associated with Stream.
ssl_set_options/3	SSL is the same as SSL0, except for the options specified in Options.
system_root_certificates/1	List is a list of trusted root certificates as provided by the OS.
statistics.pl  -- Get information about resource usage
show_profile/1	Display last collected profiling data.
statistics/0	Print information about resource usage using print_message/2.
statistics/1	Stats is a dict representing the same information as statistics/0.
thread_statistics/2	Obtain statistical information about a single thread.
time/1	Execute Goal, reporting statistics to the user.
profile/1	Run Goal under the execution profiler.
system.pl  -- System utilities
lock_predicate/1	Transform a predicate into a system predicate.
system_mode/1	Switch the system into system or user mode.
system_module/0	Any predicate defined after this declaraction uptil the end of the file will become a system predicate.
unlock_predicate/1	Transform a system predicate into a normal system predicate.
term_to_json.pl
term_to_json/3	Convert any general Prolog term into a JSON term.
terms.pl  -- Term manipulation
subsumes/2	True if Generic is unified to Specific without changing Specific.
subsumes_chk/2	True if Generic can be made equivalent to Specific without changing Specific.
term_factorized/3	Is true when Skeleton is Term where all subterms that appear multiple times are replaced by a variable and Substitution is a list of Var=Value that provides the subterm at the location Var.
term_size/2	True if Size is the size in cells occupied by Term on the global (term) stack.
term_subsumer/3	General is the most specific term that is a generalisation of Special1 and Special2.
variant/2	Same as SWI-Prolog Term1 =@= Term2.
thread.pl  -- High level thread primitives
concurrent/3	Run Goals in parallel using N threads.
first_solution/3	Try alternative solvers concurrently, returning the first answer.
concurrent_maplist/2	Concurrent version of maplist/2.
thread_pool.pl  -- Resource bounded thread management
create_pool/1	Hook to create a thread pool lazily.
current_thread_pool/1	True if Name refers to a defined thread pool.
thread_create_in_pool/4	Create a thread in Pool.
thread_pool_create/3	Create a pool of threads.
thread_pool_destroy/1	Destroy the thread pool named Name.
thread_pool_property/2	True if Property is a property of thread pool Name.
time.pl  -- Time and alarm library
call_with_time_limit/2	Call Goal, while watching out for a (wall-time) limit.
current_alarm/4	Enumerate the alarms in the schedule.
remove_alarm/1	Remove an alarm.
uninstall_alarm/1	De-activate an alarm.
alarm/3	Set up an alarm to be signaled Time seconds from now.
alarm_at/3	As alarm/3 and alarm/4, but schedule the alarm at an absolute point in time.
install_alarm/1	Install an alarm allocated using alarm/4 with the install(false) option or de-activated using uninstall_alarm/1.
tty.pl  -- Terminal operations
menu/3	Show a menu.
tty_clear/0	Clear the display.
tty_flash/0	Give visual signal if possible, otherwise beep.
ugraphs.pl  -- Graph manipulation library
compose/3	Calculates the composition of two S-form graphs, which need not have the same set of vertices.
del_vertices/3	Unify NewGraph with a new graph obtained by deleting the list of Vertices and all the edges that start from or go to a vertex in Vertices to the Graph.
edges/2	Edges is the set of edges in UGraph.
transpose_ugraph/2	Unify NewGraph with a new graph obtained from Graph by replacing all edges of the form V1-V2 by edges of the form V2-V1.
ugraph_union/3	Is true when Union is the union of Set1 and Set2.
vertices/2	Strips off the neighbours lists of an S-representation to produce a list of the vertices of the graph.
vertices_edges_to_ugraph/3	Create a UGraph from Vertices and edges.
neighbors/3	Neigbours is a sorted list of the neighbours of Vertex in Graph.
top_sort/2	Sorted is a topological sorted list of nodes in Graph.
uri.pl  -- Process URIs
iri_normalized/2	NormalizedIRI is the normalized form of IRI.
iri_normalized/3	NormalizedGlobalIRI is the normalized global version of IRI.
uri_authority_components/2	Break-down the authority component of a URI.
uri_authority_data/3	Provide access the uri_authority structure.
uri_components/2	Break a URI into its 5 basic components according to the RFC-3986 regular expression:.
uri_data/3	Provide access the uri_component structure.
uri_data/4	NewComponents is the same as Components with Field set to Data.
uri_encoded/3	Encoded is the URI encoding for Value.
uri_file_name/2	Convert between a URI and a local file_name.
uri_iri/2	Convert between a URI, encoded in US-ASCII and an IRI.
uri_is_global/1	True if URI has a scheme.
uri_normalized/2	NormalizedURI is the normalized form of URI.
uri_normalized/3	NormalizedGlobalURI is the normalized global version of URI.
uri_normalized_iri/2	As uri_normalized/2, but percent-encoding is translated into IRI Unicode characters.
uri_normalized_iri/3	NormalizedGlobalIRI is the normalized global IRI of URI.
uri_query_components/2	Perform encoding and decoding of an URI query string.
uri_resolve/3	Resolve a possibly local URI relative to Base.
url.pl  -- Analysing and constructing URL
file_name_to_url/2	Translate between a filename and a file:// URL.
global_url/3	Translate a possibly relative URL into an absolute one.
http_location/2	Construct or analyze an HTTP location.
is_absolute_url/1	True if URL is an absolute URL.
parse_url/2	Construct or analyse a URL.
parse_url/3	Similar to parse_url/2 for relative URLs.
parse_url_search/2	Construct or analyze an HTTP search specification.
set_url_encoding/2	Query and set the encoding for URLs.
url_iri/2	Convert between a URL, encoding in US-ASCII and an IRI.
www_form_encode/2	En/decode to/from application/x-www-form-encoded.
utf8.pl  -- UTF-8 encoding/decoding on lists of character codes.
utf8_codes//1	DCG translating between a Unicode code-list and its UTF-8 encoded byte-string.
uuid.pl  -- Universally Unique Identifier (UUID) Library
uuid/1	UUID is an atom representing a new UUID.
uuid/2	Create a new UUID according to Options.
when.pl  -- Conditional coroutining
when/2	Execute Goal when Condition is satisfied.
www_browser.pl  -- Open a URL in the users browser
expand_url_path/2	Expand URL specifications similar to absolute_file_name/3.
known_browser/2	True if browser FileBaseName has a remote protocol compatible to Compatible.
www_open_url/1	Open URL in running version of the users' browser or start a new browser.
xpath.pl  -- Select nodes in an XML DOM
xpath/3	Match an element in a DOM structure.
xpath_chk/3	Semi-deterministic version of xpath/3.
xsdp_types.pl  -- XML-Schema primitive types
xsdp_convert/3	Convert the content model Content to an object of the given XSD type and return the Prolog value in Value.
xsdp_numeric_uri/2	Table mapping all XML-Schema numeric URIs into the type they promote to.
xsdp_subtype_of/2	True if Type is a (transitive) subtype of Super.
xsdp_type/1	Test/generate the names for the XML schema primitive types.
xsdp_uri_type/2	True if URI is the URI for the the XML-Schema primitive Type.
zlib.pl  -- Zlib wrapper for SWI-Prolog
encoding_filter/3	Act as plugin for library(http/http_open) for processing content with Content-encoding: gzip.
gzopen/3	Open a file compatible with the gzip program.