Define properties to contain literal values.
Data type classes enable you to enforce sets of rules about the values of literal-valued properties. InterSystems provides an extensible set of data type classes. Each data type class has the following features:
It specifies values for compiler keywords. Among other things, these control how the property is projected to SQL, ODBC, ActiveX, and Java clients.
It specifies values for property parameters.
It provides a set of methods to translate data among the stored (on disk), logical (in memory), and display formats.
Represents a MultiValue date.