Non-terminal symbol `AttributeName_opt`

Defining rules for nonterminal symbol AttributeName_opt:

`AttributeName_opt`
		`AttributeName`

Occurrences of symbol AttributeName_opt in body of other rules:

`AttributeValue`		`POSITION` `XmlPath_opt` `AttributeName_opt`
`TextRef`		`ChildXmlTree` `AttributeName_opt`
`XmlTreeRef`		`XmlChildSpec` `AttributeName_opt`

Non-terminal symbol AttributeName_opt