OMF File format

I am building a little utility to see into library files. I am using the MCS-51 object module format specification V5.0 referenced in this web.

I get some record types id non-described in that reference: 0x20, 0x22, 0x24, 0x70 and 0x72.

Is the V5.0 obsolete ?
Are they custom extensions ?
Am i doing something wrong ?

Thanks in advance
Javier

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