The OfficeArtSpgrContainer record specifies a container for groups of shapes. The group container contains a variable number of shape containers and other group containers. Each group is a shape. The first container MUST be an OfficeArtSpContainer record, as defined in section 2.2.14, which MUST contain shape information for the group (4).
rh (8 bytes): An OfficeArtRecordHeader structure, as defined in section 2.2.1, that specifies the header for this record. The following table specifies the subfields.
A value that MUST be 0xF.
A value that MUST be 0x000.
A value that MUST be 0xF003.
An unsigned integer that specifies the number of bytes following the header that contain group or shape container records. This value MUST be the size, in bytes, of rgfb.
rgfb (variable): An array of OfficeArtSpgrContainerFileBlock records, as defined in section 2.2.17, that specifies the groups or shapes that are contained within this group.