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Class derived from Embperl::Syntax to define the syntax for
RTF files. RTF files can be read and written by various word processing
programs. This allows you to create dynamic wordprocessing documents or
let process serial letters thru Embperl. Currently Embperl regocnices the fields DOCVARIABLE, MERGEFIELD and
NEXT. Variablenames are resolved as hash keys to $param[0] e.g. foo.bar
referes to $param[0]{foo}{bar}, the @param Array can by set via the
param parameter of the Execute function. NEXT moves to the next element
of the @param array. If the end of the document is reached, Embperl repeats
the document until all element of @param are processed. This can for example
be use to tie a database table to @param and generate a serial letter. NOTE: Extenting this syntax to support full Embperl support (like embedding Perl
into RTF file is planned, but not implemented yet)
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