sys.xml_schema_namespaces (Transact-SQL)
Returns a row per XSD-defined XML namespace. The following tuples are unique: collection_id, namespace_id, and collection_id, and name.
Column name  | 
Data type  | 
Description  | 
|---|---|---|
xml_collection_id  | 
int  | 
ID of the XML schema collection that contains this namespace.  | 
name  | 
nvarchar(4000)  | 
Name of XML namespace. Blank name indicates no target namespace.  | 
xml_namespace_id  | 
int  | 
1-based ordinal that uniquely identifies the XML namespace in the database.  | 
Permissions
In SQL Server 2005 and later versions, the visibility of the metadata in catalog views is limited to securables that a user either owns or on which the user has been granted some permission. For more information, see Metadata Visibility Configuration.