question: public static void expressionAttributes ( SimpleMethod method , Element element , String ... attributeNames ) throws ValidationException { for ( String name : attributeNames ) { String attributeValue = element . getAttribute ( name ) ; if ( attributeValue . length ( ) > 0 ) { if ( attributeValue . startsWith ( "${" ) && attributeValue . endsWith ( "}" ) ) { attributeValue = attributeValue . substring ( 2 , attributeValue . length ( ) - 1 ) ; } if ( MiniLangUtil . containsScript ( attributeValue ) ) { handleError ( "Expression attribute \"" + name + "\" cannot contain a script (remove script)." , method , element ) ; } } } }
target:  Tests if element attributes are expression type.