link_uri_attr_name
link_uri_attr_name (tagname[, doc])
This function returns the name of the Universal Resource Indicator (URI) attribute (for example, “url”) for the link tag named tagname. If no such attribute is defined for the tag, link_uri_attr_name returns the null string.
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Even if you have applied an alias map to the document, this function will return an attribute's real name, not its alias.
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The doc argument specifies the identifier of the document tree to query. If omitted or 0, the current document is used.
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If the document type definition for your document instance includes the NAMECASE GENERAL NO setting, then the tagname parameter will be case-sensitive.
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