PropertyHandle :: ProvideExtension - Create property extension

The function allows creating a property extension with the name passed in sExtension , which is based on an extension property, i.e. a property that has been defined as extension property in the database or dictionary. The function has to be called for managed property extensions, only. The function returns true , when the instance has been created successfully or when the extension has already been added to the instance's extension list. In order to check, whether the property extension exists or not, Property ::extensionExist() might be called.

The function throws an exception, when the property does not refer to an extendable data type.

The function throws an exception when being called for an ordinary property (i.e. a property, which is not an extension property.