}
else
{
// Unlike Flex 4.5, we report a problem if the format
// is anything other than "e4x" or "xml".
ICompilerProblem problem = new MXMLUnknownXMLFormatProblem(attribute);
builder.addProblem(problem);
// But like Flex 4.5, we default to "xml"
// if neither is specified.
xmlType = XML_TYPE.OLDXML;