linter: when verifying a type's name, if a type is imported from an XML schema we cannot easily get the set of defined types, so, provided the type's namespace is declared, report no error

Author: pgfearo

src/xsltTokenDiagnostics.ts

@@ -2045,6 +2045,9 @@ export class XsltTokenDiagnostics {
 } else {
 isValidType = FunctionData.schema.indexOf(tParts[1] + '#1') > -1;
 }
+} else {
+// assume this is an imported XML Schema type
+isValidType = true;
 }
 }
 }