attr_value_alias
attr_value_alias (value[, attr[, element[, doc]]])
This function returns the alias of the specified attribute value, where value is the real name of the attribute value as defined in the DTD, or its alias. Specify attr and element if you want this function to return the alias of an element-specific attribute value (element and attr can be real names or aliases). If both attr and element are omitted, this function returns the alias of a global attribute value. A null string is returned if value does not have an alias.
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If element is specified and there is no element-specific alias for value, this function will return a null string even if a global attribute value exists for value.
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The doc argument specifies the identifier of the document tree to query. If omitted or 0, the current document is searched.
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