Problem

The design of a MetaEd model requires a new enumeration.  

Solution

Create a new enumeration in the MetaEd source files and reference it where necessary. Build MetaEd. All technical artifacts related to the new enumeration will be updated.

Discussion

An enumeration is a set of values, which are called enumeration items. Enumerations can be used as properties in other entities to constrain the valid values of the property to items in the set of values. Each item must be distinct within a given enumeration.

Consider the following declaration:

Enumeration CharterApprovalAgencyType
    documentation "The type of agency that approved the establishment or continuation of a charter school."
	item "State board of education"
	item "Public charter school board"
	item "University"
	item "Other"
 

CharterApprovalAgencyType is a new enumeration defined with four enumeration items.

Now consider a usage of the new enumeration:

Domain Entity School based on EducationOrganization
    documentation "This entity represents an educational organization that includes..."
    ...
	enumeration CharterApprovalAgencyType
		documentation "The type of agency that approved the establishment or continuation of a charter school."
		is optional

Here, a reference to the enumeration CharterApprovalAgencyType has been added to EducationOrganization. The enumeration keyword is used for that purpose. In this case, School is modeled to have an optional CharterApprovalAgencyType.