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XMLIF(1)										 XMLIF(1)

NAME
       xmlif - conditional processing instructions for XML

SYNOPSIS
       xmlif [attrib=value...]

DESCRIPTION
       xmlif  filters XML according to conditionalizing markup. This can be useful for formatting
       one of several versions of an XML document depending on conditions passed to the command.

       Attribute/value pairs from the command line are matched against the attributes  associated
       with  certain  processing instructions in the document. The instructions are <?if> and its
       inverse <?if not>, <?elif> and its inverse <?elif not>, <?else>, and <?fi>.

       Argument/value pairs given on the command line are checked against  the	value  of  corre-
       sponding  attributes in the conditional processing instructions. An `attribute match' hap-
       pens if an attribute occurs in both the command-line arguments and the tag, and the values
       match.  An  `attribute  mismatch'  happens if an attribute occurs in both the command-line
       arguments and the tag, but the values do not match.

       Spans between <?if> or <?elif> and the next conditional processing instruction at the same
       nesting level are passed through unaltered if there is at least one attribute match and no
       attribute mismatch; spans between <?if not> and <?elif not> and the next conditional  pro-
       cessing	instruction are passed otherwise. Spans between <?else> and the next conditional-
       processing tag are passed through only if no previous span at  the  same  level	has  been
       passed  through.  <?if>	and  <?fi>  (and their `not' variants) change the current nesting
       level; <?else> and <?elif> do not.

       All these processing instructions will be removed from the output produced. Aside from the
       conditionalization,  all  other	input  is passed through untouched; in particular, entity
       references are not resolved.

       Value matching is by string equality, except that "|" in an attribute value is interpreted
       as  an alternation character. Thus, saying foo='red|blue' on the command line enables con-
       ditions red and blue. Saying color='black|white' in a tag matches command-line  conditions
       color='black' and color='white'.

       Here is an example:

       Always issue this text.
       <?if condition='html'>
       Issue this text if 'condition=html' is given on the command line.
       <?elif condition='pdf|ps'>
       Issue this text if 'condition=pdf' or 'condition=ps'
       is given on the command line.
       <?else>
       Otherwise issue this text.
       <?fi>
       Always issue this text.

FUTURE DIRECTIONS
       The mark-up used by this tool is not set in stone, and may change in the near future.

AUTHOR
       Eric S. Raymond.

					   Sep 26 2002					 XMLIF(1)
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