question: public SchemaImpl createSchema ( String targetNamespace , Locator location , boolean elementFormDefault , boolean attributeFormDefault ) { SchemaImpl obj = ( SchemaImpl ) schemas . get ( targetNamespace ) ; if ( obj == null ) { obj = new SchemaImpl ( this , location , targetNamespace , elementFormDefault , attributeFormDefault ) ; schemas . put ( targetNamespace , obj ) ; schemas2 . add ( obj ) ; } return obj ; }
target:  Gets a reference to the existing schema or creates a new one if none exists yet.