oid_id_attr_name
oid_id_attr_name (oid)
This function returns the name of the ID attribute for the element specified by oid. oid_id_attr_name returns the null string if the oid is not valid or the element does not declare an ID-type attribute.
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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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