xmlif - Online in the Cloud

PROGRAM:

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.

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