Frame

Defines a coordinate frame, or "frame of reference." The Frame template is open and can contain any object. The D3DX mesh-loading functions recognize Mesh, FrameTransformMatrix, and Frame template instances as child objects when loading a Frame instance.

template Frame
{
    < 3D82AB46-62DA-11CF-AB39-0020AF71E433 >
    [...]			
} 

The frame template recognizes child Frame and Mesh nodes inside a frame and can recognize user-defined templates through a callback function.