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The {{mediawiki|Extension:ParserFunctions|ParserFunctions}} extension provides ten additional parser functions to supplement the "[[СправкаHelp:Ключевые словаMagic words|magic words]]", which are already present in MediaWiki. All the parser functions provided by this extension take the form:
:<tt><nowiki>{{</nowiki> '''#functionname''': ''argument 1'' | ''argument 2'' | ''argument 3'' ... <nowiki>}}</nowiki></tt>
:<tt><nowiki>{{subst:#ifexist:</nowiki> {{FULLPAGENAME}} <nowiki>| [[</nowiki>{{FULLPAGENAME}}<nowiki>]] | </nowiki>{{FULLPAGENAME}}<nowiki> }}</nowiki></tt> → the code '''<tt><nowiki>[[</nowiki>{{FULLPAGENAME}}<nowiki>]]</nowiki></tt>''' will be inserted in the wikitext since the page {{FULLPAGENAME}} exists.
{{warning|The results of substituted parser functions are undefined if the expressions contain ''un''substituted volatile code such as [[СправкаHelp:Ключевые словаMagic words|variables]] or other parser functions. For consistent results, all the volatile code in the expression to be evaluated must be substituted. See [[w:Help:Substitution|Help:Substitution]].}}
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