xml - How do I compare attribute to a lower case value? -

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how create filter attribute value lowercase?

this works: 

xmlitem = xml.*.(attribute("name")==propertyname);

but throwing error: 

xmlitem = xml.*.(attribute("name").tolowercase()==propertyname);

it looks have use tostring() string object , can use tolowercase(): 

var xmllist:xmllist = xml.*.(attribute("name").tostring().tolowercase()==lowercasepropertyname);

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