Xpand Template Language - Eclipse Modeling Project: A Domain-Specific Language Toolkit - page 629

Object
Naturally, no literals exist for Object, but there are two operators:

obj1 == obj2 // equals
obj1 != obj2 // not equals

Vo i d
The only possible instance of Void is the null reference. Therefore, just one lit-
eral exists: null .

Type Literals
The literal for types is simply the name of the type—for example:

String // the type string
my::special::Type // evaluates to the type 'my::special::Type'

The literal for static properties (also known as enumeration literals) is simi-
lar to type literals:

my::Color::RED

Two different literal syntaxes are used for Strings (with the same semantics):

'a String literal'
"a String literal"

For Strings, the expression language supports the plus operator that is over-
loaded with concatenation:

'The element ' + element.name + ' is ' + element.state

The Boolean literals are true and false .
These are the Boolean operators:

true && false // AND

true || false // OR

! true // NOT