HMS common inside plant management information base (MIB) : SCTE-HMS-HE-RF-AMP-MIB / Engineering Committee, Hybrid Management Sub-layer Subcommittee, Society of Cable Telecommunication Engineers. (OCLC #953963863)
Though this piece has a cover and front matter in English, the bulk of the content (everything after page 1) is computer code (SNMP, maybe).
I coded the Lang fixed field as English:
Lang: eng
but considered that it is more similar to notated music, which is cataloged as having no linguistic content:
Lang: zxx
What do you think?