question: public static boolean isPropertyField ( String fieldName ) { return ! ID_FIELD_NAME . equals ( fieldName ) && ! URI_FIELD_NAME . equals ( fieldName ) && ! TEXT_FIELD_NAME . equals ( fieldName ) && ! CONTEXT_FIELD_NAME . equals ( fieldName ) && fieldName . charAt ( 0 ) != '_' ; }
target:  Determines whether the specified field name is a property field name.