target_id_attr_name
target_id_attr_name (tagname[, doc])
This function returns the name of the ID attribute (for example, id) for the target tag specified by tagname. If the tag has no such attribute, target_id_attr_name returns the null string.
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If you have applied an alias map to the document, tagname can be either an alias or a real name. However, 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. If doc is omitted or 0, the current document is used.