A set of name-value pairs for properties set for the map document (mxd only). These properties are string values set in the map document's Map Properties dialog and include: Title, Subject, Author, Category, Keywords and Comments.
[Visual Basic 6.0] Property DocumentInfo As IPropertySet
[Visual Basic .NET] Public ReadOnly Property DocumentInfo As IPropertySet
[C#] public IPropertySet DocumentInfo {get;}
[Java] public IPropertySet getDocumentInfo() throws IOException, AutomationException
[C++] HRESULT get_DocumentInfo( IPropertySet** props );