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XMLIF(1) xmlif 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 con- ditions passed to the command. Attribute/value pairs from the command line are matched against the attrib- utes associated with certain processing instructions in the document. The instructions are <?xmlif if?> and its inverse <?xmlif if not?>, <?xmlif elif?> and its inverse <?xmlif elif not?>, <?xmlif else?>, and <?xmlif fi?>. Argument/value pairs given on the command line are checked against the value of corresponding attributes in the conditional processing instruc- tions. An `attribute match' happens if an attribute occurs in both the com- mand-line arguments and the tag, and the values match. An `attribute mis- match' happens if an attribute occurs in both the command-line arguments and the tag, but the values do not match. Spans between <?xmlif if?> or <?xmlif elif?> and the next conditional pro- cessing instruction at the same nesting level are passed through unaltered if there is at least one attribute match and no attribute mismatch; spans between <?xmlif if not?> and <?xmlif elif not?> and the next conditional processing instruction are passed otherwise. Spans between <?xmlif else?> and the next conditional-processing tag are passed through only if no pre- vious span at the same level has been passed through. <?xmlif if?> and <?xmlif fi?> (and their `not' variants) change the current nesting level; <?xmlif else?> and <?xmlif elif?> do not. All these processing instructions will be removed from the output produced. Aside from the conditionalization, all other input is passed through un- touched; 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. <?xmlif if condition='html'?> Issue this text if 'condition=html' is given on the command line. <?xmlif elif condition='pdf|ps'?> Issue this text if 'condition=pdf' or 'condition=ps' is given on the command line. <?xmlif else?> Otherwise issue this text. <?xmlif fi?> Always issue this text. AUTHOR Eric S. Raymond <esr@snark.thyrsus.com> Author of xmlif program Linux April 2009 XMLIF(1)
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