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 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 <?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
       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 <?xmlif if?> or <?xmlif 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 <?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 previous 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 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.
	   <?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)