= Term: PropertyType =

Defines a named slot in a MeshObject.

A PropertyType must be defined as part of an EntityType. When a MeshObject is blessed with that EntityType, the PropertyType is applied to the MeshObject, leading to a [wiki:Property] on the MeshObject that may be accessed.

Each PropertyType has a name, a MeshTypeIdentifier, a description, a DataType and a default value. A PropertyType may be mandatory or optional (i.e. does not or does allow `null` values), and it may be read-write or read-only.

Note that in the InfoGrid context, the term [wiki:Property] refers to instance information, while PropertyType refers the type information.

See also:
 * DataType
 * [wiki:Property]
 * ProjectedProperty
 * ProjectedPropertyType.