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RedHat 9 (Linux i386) - man page for xmlif (redhat section 1)

XMLIF(1)																  XMLIF(1)

xmlif - conditional processing instructions for XML
xmlif [attrib=value...]
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 docu- ment. 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 corresponding attributes in the conditional processing instructions. An `attribute match' happens 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 process- ing 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 conditions 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.
The mark-up used by this tool is not set in stone, and may change in the near future.
Eric S. Raymond. Sep 26 2002 XMLIF(1)

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