The answer given for the question is not quite consistent with SQL 2012.

In fact, the SERVER scope DDL triggers present as,

"DDL triggers are not scoped to schemas. Therefore, functions such as OBJECT_ID, OBJECT_NAME, OBJECTPROPERTY, and OBJECTPROPERTYEX cannot be used for querying metadata about DDL triggers. Use the catalog views instead.

Server-scoped DDL triggers appear in the SQL Server Management Studio Object Explorer in the Triggers folder. This folder is located under the Server Objects folder. Database-scoped DDL triggers appear in the Database Triggers folder. This folder is located under the Programmability folder of the corresponding database."

Reference: http://msdn.microsoft.com/en-us/library/ms175941.aspx