The XmlTkEndSurface structure specifies the end of a back wall definition. The back wall is the wall that is parallel to the category (2) axis. This structure defines additional properties for the back wall of the current chart. This structure MUST have a corresponding XmlTkStartSurface structure.
endSurface (4 bytes): An XmlTkEnd that specifies the end of a back wall definition. The endSurface.xtHeader.xmlTkTag field MUST be equal to the startSurface.xtHeader.xmlTkTag of the corresponding XmlTkStartSurface structure.