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<H1><A NAME="sec:A"><SPAN class="sec-nr">A</SPAN> <SPAN class="sec-title">The
SWI-Prolog library</SPAN></A></H1>
<A NAME="sec:libpl"></A>
<P>This chapter documents the SWI-Prolog library. As SWI-Prolog provides
auto-loading, there is little difference between library predicates and
built-in predicates. Part of the library is therefore documented in the
rest of the manual. Library predicates differ from built-in predicates
in the following ways.
<P>
<UL class="latex">
<LI>User-definition of a built-in leads to a permission-error, while
using the name of a library predicate is allowed.
<P>
<LI>If autoloading is disabled explicitely or because trapping unknown
predicates is disabled (see <A NAME="idx:unknown2:1558"></A><A class="pred" href="debugger.html#unknown/2">unknown/2</A>
and
<A NAME="idx:currentprologflag2:1559"></A><A class="pred" href="flags.html#current_prolog_flag/2">current_prolog_flag/2</A>),
library predicates must be loaded explicitely.
<P>
<LI>Using libraries reduce the footprint of applications that don't need
them.
</UL>
<BLOCKQUOTE><EM>The documentation of the library is just started.
Material from the standard packages should be moved here, some material
from other parts of the manual should be moved too and various libraries
are not documented at all.
</EM></BLOCKQUOTE>
<P>
<HR>
<CENTER>
<H2>Section Index</H2>
</CENTER>
<HR>
<DIV class="toc">
<DIV class="toc-h2"><A class="sec" href="aggregate.html"><SPAN class="sec-nr">A.1</SPAN> <SPAN class="sec-title">library(aggregate):
Aggregation operators on backtrackable predicates</SPAN></A></DIV>
<DIV class="toc-h4"><A class="sec" href="aggregate.html#sec:A.1.1"><SPAN class="sec-nr">A.1.1</SPAN> <SPAN class="sec-title">Acknowledgements</SPAN></A></DIV>
<DIV class="toc-h2"><A class="sec" href="apply.html"><SPAN class="sec-nr">A.2</SPAN> <SPAN class="sec-title">library(apply):
Apply predicates on a list</SPAN></A></DIV>
<DIV class="toc-h2"><A class="sec" href="assoc.html"><SPAN class="sec-nr">A.3</SPAN> <SPAN class="sec-title">library(assoc):
Association lists</SPAN></A></DIV>
<DIV class="toc-h2"><A class="sec" href="broadcast.html"><SPAN class="sec-nr">A.4</SPAN> <SPAN class="sec-title">library(broadcast):
Broadcast and receive event notifications</SPAN></A></DIV>
<DIV class="toc-h2"><A class="sec" href="charsio.html"><SPAN class="sec-nr">A.5</SPAN> <SPAN class="sec-title">library(charsio):
I/O on Lists of Character Codes</SPAN></A></DIV>
<DIV class="toc-h2"><A class="sec" href="check.html"><SPAN class="sec-nr">A.6</SPAN> <SPAN class="sec-title">library(check):
Elementary completeness checks</SPAN></A></DIV>
<DIV class="toc-h2"><A class="sec" href="clpfd.html"><SPAN class="sec-nr">A.7</SPAN> <SPAN class="sec-title">library(clpfd):
Constraint Logic Programming over Finite Domains</SPAN></A></DIV>
<DIV class="toc-h2"><A class="sec" href="clpqr.html"><SPAN class="sec-nr">A.8</SPAN> <SPAN class="sec-title">library(clpqr):
Constraint Logic Programming over Rationals and Reals</SPAN></A></DIV>
<DIV class="toc-h3"><A class="sec" href="clpqr.html#sec:A.8.1"><SPAN class="sec-nr">A.8.1</SPAN> <SPAN class="sec-title">Solver
predicates</SPAN></A></DIV>
<DIV class="toc-h3"><A class="sec" href="clpqr.html#sec:A.8.2"><SPAN class="sec-nr">A.8.2</SPAN> <SPAN class="sec-title">Syntax
of the predicate arguments</SPAN></A></DIV>
<DIV class="toc-h3"><A class="sec" href="clpqr.html#sec:A.8.3"><SPAN class="sec-nr">A.8.3</SPAN> <SPAN class="sec-title">Use
of unification</SPAN></A></DIV>
<DIV class="toc-h3"><A class="sec" href="clpqr.html#sec:A.8.4"><SPAN class="sec-nr">A.8.4</SPAN> <SPAN class="sec-title">Non-linear
constraints</SPAN></A></DIV>
<DIV class="toc-h2"><A class="sec" href="csv.html"><SPAN class="sec-nr">A.9</SPAN> <SPAN class="sec-title">library(csv):
Process CSV (Comma-Separated Values) data</SPAN></A></DIV>
<DIV class="toc-h2"><A class="sec" href="debug.html"><SPAN class="sec-nr">A.10</SPAN> <SPAN class="sec-title">library(debug):
Some reusable code to help debugging applications</SPAN></A></DIV>
<DIV class="toc-h2"><A class="sec" href="gensym.html"><SPAN class="sec-nr">A.11</SPAN> <SPAN class="sec-title">library(gensym):
Generate unique identifiers</SPAN></A></DIV>
<DIV class="toc-h2"><A class="sec" href="lists.html"><SPAN class="sec-nr">A.12</SPAN> <SPAN class="sec-title">library(lists):
List Manipulation</SPAN></A></DIV>
<DIV class="toc-h2"><A class="sec" href="nb_set.html"><SPAN class="sec-nr">A.13</SPAN> <SPAN class="sec-title">library(nb_set):
Non-backtrackable set</SPAN></A></DIV>
<DIV class="toc-h2"><A class="sec" href="www_browser.html"><SPAN class="sec-nr">A.14</SPAN> <SPAN class="sec-title">library(www_browser):
Activating your Web-browser</SPAN></A></DIV>
<DIV class="toc-h2"><A class="sec" href="option.html"><SPAN class="sec-nr">A.15</SPAN> <SPAN class="sec-title">library(option):
Option list processing</SPAN></A></DIV>
<DIV class="toc-h2"><A class="sec" href="ordsets.html"><SPAN class="sec-nr">A.16</SPAN> <SPAN class="sec-title">library(ordsets):
Ordered Set Manipulation</SPAN></A></DIV>
<DIV class="toc-h2"><A class="sec" href="pairs.html"><SPAN class="sec-nr">A.17</SPAN> <SPAN class="sec-title">library(pairs):
Operations on key-value lists</SPAN></A></DIV>
<DIV class="toc-h2"><A class="sec" href="pio.html"><SPAN class="sec-nr">A.18</SPAN> <SPAN class="sec-title">library(pio):
Pure I/O</SPAN></A></DIV>
<DIV class="toc-h3"><A class="sec" href="pio.html#sec:A.18.1"><SPAN class="sec-nr">A.18.1</SPAN> <SPAN class="sec-title">library(pure_input):
Pure Input from files</SPAN></A></DIV>
<DIV class="toc-h2"><A class="sec" href="prolog_xref.html"><SPAN class="sec-nr">A.19</SPAN> <SPAN class="sec-title">library(prolog_xref):
Cross-reference data collection library</SPAN></A></DIV>
<DIV class="toc-h3"><A class="sec" href="prolog_xref.html#sec:A.19.1"><SPAN class="sec-nr">A.19.1</SPAN> <SPAN class="sec-title">Extending
the library</SPAN></A></DIV>
<DIV class="toc-h2"><A class="sec" href="readutil.html"><SPAN class="sec-nr">A.20</SPAN> <SPAN class="sec-title">library(readutil):
Reading lines, streams and files</SPAN></A></DIV>
<DIV class="toc-h2"><A class="sec" href="record.html"><SPAN class="sec-nr">A.21</SPAN> <SPAN class="sec-title">library(record):
Access named fields in a term</SPAN></A></DIV>
<DIV class="toc-h2"><A class="sec" href="registry.html"><SPAN class="sec-nr">A.22</SPAN> <SPAN class="sec-title">library(registry):
Manipulating the Windows registry</SPAN></A></DIV>
<DIV class="toc-h2"><A class="sec" href="simplex.html"><SPAN class="sec-nr">A.23</SPAN> <SPAN class="sec-title">library(simplex):
Solve linear programming problems</SPAN></A></DIV>
<DIV class="toc-h3"><A class="sec" href="simplex.html#sec:A.23.1"><SPAN class="sec-nr">A.23.1</SPAN> <SPAN class="sec-title">Example
1</SPAN></A></DIV>
<DIV class="toc-h3"><A class="sec" href="simplex.html#sec:A.23.2"><SPAN class="sec-nr">A.23.2</SPAN> <SPAN class="sec-title">Example
2</SPAN></A></DIV>
<DIV class="toc-h3"><A class="sec" href="simplex.html#sec:A.23.3"><SPAN class="sec-nr">A.23.3</SPAN> <SPAN class="sec-title">Example
3</SPAN></A></DIV>
<DIV class="toc-h2"><A class="sec" href="threadpool.html"><SPAN class="sec-nr">A.24</SPAN> <SPAN class="sec-title">library(thread_pool):
Resource bounded thread management</SPAN></A></DIV>
<DIV class="toc-h2"><A class="sec" href="ugraphs.html"><SPAN class="sec-nr">A.25</SPAN> <SPAN class="sec-title">library(ugraphs):
Unweighted Graphs</SPAN></A></DIV>
<DIV class="toc-h2"><A class="sec" href="url.html"><SPAN class="sec-nr">A.26</SPAN> <SPAN class="sec-title">library(url):
Analysing and constructing URL</SPAN></A></DIV>
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