|IClone (esriSystem)||Provides access to members that control cloning of objects.|
|IGPMessage||Provides access to the properties of a Geoprocessor message.|
|IGPMessages||Provides access to Geoprocessor messages.|
|IXMLSerialize (esriSystem)||Provides access to members that XML serialize and deserialize an object to/from XML.|
The GPMessages object is a container of a collection of GPMessage objects.
For the Validate method, the messages are returned as an array of GPMessage objects. The layout of the returned array is the same as the input array of values, which is the same as the array of tool parameter descriptions.
Also refer to Building Geoprocessing Function Tools .