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General format
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<TR><TD><FONT SIZE=4><B><A NAME="htoc30">5.1</A></B></FONT></TD>
<TD WIDTH="100%" ALIGN=center><FONT SIZE=4><B>General format</B></FONT></TD>
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The definition of control constructs, directives and built-in predicates is
presented as follows:<BR>
<BR>
<B>Templates</B><BR>
<BR>
Specifies the types of the arguments and which of them shall be instantiated
(mode). Types and modes are described later (section <A HREF="manual018.html#Types-and-modes">5.2</A>).<BR>
<BR>
<B>Description</B><BR>
<BR>
Describes the behavior (in the absence of any error conditions). It is
explicitly mentioned when a built-in predicate is re-executable on
backtracking. Predefined operators involved in the definition are also
mentioned.<BR>
<BR>
<B>Errors</B><BR>
<BR>
Details the error conditions. Possible errors are detailed later
(section <A HREF="manual019.html#Errors">5.3</A>). For directives, this part is omitted.<BR>
<BR>
<B>Portability</B><BR>
<BR>
Specifies whether the definition conforms to the ISO standard or is a GNU Prolog
extension.<BR>
<BR>
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