=head1 NAME ictags - Interchange Tags Reference =head1
DESCRIPTION =head1 Interchange Tag Reference Interchange
functions are accessed via the Interchange Tag Language (ITL).
The pages in a catalog may be mostly HTML, but they will use ITL
tags to provide access to Interchange's functions. ITL is a
superset of MML, or Minivend Markup Language. Minivend was the
predecessor to Interchange. These tags perform various display
and modification operations for the user session. There nearly
100 standard predefined tags, and the UserTag facility allows
you to create tags that perform your own functions and can be
just as powerful as the built-in tags. This document covers
Interchange versions 4.7 through 4.9. =head1 Tag Syntax ITL tags
are similar to HTML in syntax, in that they accept parameters or
attributes and that there are both I and I tags. We will call an
attribute a I if it may be called positionally or if it must be
included (see the I and I sections below). A standalone tag has
no ending element, e.g.: [va