All model geometry and objects are defined within the <Block> tag in the following general format:
<Block ObjId="Block1">
<Extent>...</Extent>
<PlanePanel ObjId="810-000" DataType="181" Instance="AsDefined">...</PlanePanel>
.
.
<CurvedPanel ObjId="CG810-1" DataType="501" Instance="Both">...</CurvedPanel>
.
.
</Block>