The <entity> subtag represents an entity in the object model repository. Attributes are:
- type specifies the entity type.
- name specifies the entity name.
- produced optionally indicates whether the entity is extracted, in which case it is deleted from the repository when the source file
is invalidated (yes or no, the default).
Use the <attr> subtag to specify entity attributes. Attributes of the subtag are:
- name specifies the attribute name.
- value contains an expression that defines the attribute value.
- join specifies the delimiter to use if all possible variable values are to be joined in a single value.
Use the <cond> subtag to specify a condition.