@defgroup builtins Core Built-ins
[TOC]
This chapter describes the core built-in predicates that control the execution of
Prolog programs, provide fundamental functionality such as termm manipulation or arithmetic, and support interaction with external
resources.
@{
Many of the predicates described here have been standardised by the International Standard Organization.
The corresponding standartised subset of Prolog also known as ISO-Prolog.
In the description of the arguments of predicates the following
notation will be used:
+ a preceding plus sign will denote an argument as an "input
argument" - the argument is read, not written, and it cannot
be a free variable at the time of the call;
+ a preceding minus sign will denote an "output argument";
+ an argument with no preceding symbol can be used in both ways.
@}
