DataType declaration start with the type keyword and are used to specify simple datatypes whose details are not explicitly modeled and are used to

DataTypes can declare any number of string,int or boolean parameter to parameterize and convey additional information. DataTypes are also identified by name, and they are used as the types of attributes.

type BarType instancetype org.foo.BarType

The openXMA dsl platform ships with a default datatype library - Library.xmadsl - with pre-defined standard datatypes like String,Integer,Long,Float,Boolean,Date,Timestamp,Double and BigDecimal. The datatypes within this library are implicitly visible to all referring elements and don't have to be manually imported. Some of this datatypes are parameterizable and therefore accept one ore more parameter values to set some additional constraints on the corresponding attribute type.

entity Customer extends BaseEntity {
    String(25) firstName
    Date("Full") birthDate  
}

For example the String(25) declaration taken from the previous example states that the length of the text value of the corresponding attribute is restricted to a maximum of 25 characters.