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In certain cases it will be useful if the parser does not parse the parameters of parser functions elements.

Example:
{{#example:1|{{a}}|3}}

Would contain the values of '1', '{{a}}' and '3' rather than whatever {{a}} must have parsed to for the second element.

I refer especially in consideration to the NaturalLanguageList extension (http://www.mediawiki.org/wiki/Extension:NaturalLanguageList) I am working on.

For instance, right now this is not really possible:

{{#list:format={{a|$1}}|blanks=true|0| |2|3| |5}}

Assuming if {{a}} was '''{{{1|nothing set}}}''', and its end result would simply be:

'''0''', '''''', '''2''', '''3''', '''''' and '''5'''

Since the format={{a|$1}} had already been parsed into '''$1''', since '$1' is not blank to the parser, and so 'nothing set' will never ever occur.

Instead it should be possible to set a flag on the setFunctionHook to say that the elements should not be parsed, but rather be parsed upon request, e.g.

$parser->parseThis(element);

So the extension can decide which to be parsed where and when or if at all.