private void ExpandPERef ()
{
string peName = ReadName ();
Expect (';');
DTDParameterEntityDeclaration peDecl =
DTD.PEDecls [peName] as DTDParameterEntityDeclaration;
if (peDecl == null) {
HandleError (new XmlSchemaException ("Parameter entity " + peName + " not found.", null));
return; // do nothing
}
currentInput.PushPEBuffer (peDecl);
}