According to eIDAS (Electronic identification and trust services), a certificate for a legal person need the new directory attribute "organizationIdentifier" in its Subject DN, to identify the organization (cf. ETSI 319-412-1, § 5.1.4).
- add the attribute type "organizationIdentifier" (OID: 188.8.131.52)
- ETSI 319-412-1, v1.0.0 (2015-06) in DRAFT,
- the ETSI final documents are planed for 2016 Q1, but ITU-T X.520 had been published in October 2012,
- no short name is defined by X.520 for "organizationIdentifier" --> I propose "ORGID" (because "OID" is not a good choice!) [to discuss in comments].
ITU-T X.520 - ITU-T Recommendation database
--> § 6.4.4 Organization Identifier
ETSI EN 319 412-1 - Electronic Signatures and Infrastructures (ESI); Certificate Profiles; Part 1: Overview and common data structures
--> § 5.1.4 Legal person semantics identifier
Directory Attribute Type: organizationIdentifier