Johannes Ernst’s Blog: What is a good conceptual model for identity data?
This is the first time I’ve seen a reasonably indepth analysis of the way that Identity data can be modelled. Of particular interest is the way that the relationships can be expressed between individuals and organisations and how this fits in to any potential model. One thing that occurred to me whilst reading the article is the way that relationships, and thus identity, change over time - the concept of roles and employer organisations serves as a good example here.
I, obviously, have a relationship with my employer, which serves to initiate trust with potential customers, partners and other employees, in addition to providing a certain set of contact details (mobile phone, office phone, corporate email address). However, once a certain level of trust has been attained, the relationship could carry on independantly of my employer. For instance, I maintain contact with some former colleagues, from multiple companies, but not all. Likewise - not everyone who currently works for the same company as me has my personal contact details, and should one of leave our current employment then our ongoing relationship would effectively be ended, although some aspects of reputation (ie, the history of the relationship) would remain (something such as LinkedIn demonstrate this). This quickly makes maintaining a relationship structure extremely difficult, and after-all, if we’re not defining relationships, then why are we looking for identity.
An example of this is my personal relationship with Paul Toal which is, I’d hope, semi-independant of our professional relationship (also, this serves to demonstrate the power of URL-based identifiers). Paul himself maintains a link from his personal identity to his professional identity (whereas I choose to not make such a direct link public), whilst I have a separate connection to that same professional identity. This is further complicated by the fact that Paul is the same person (as am I), no matter whether we’re in a meeting, sitting in the pub chatting, or blogging/linking to each other - in other words, our identities are the same, but we expose different aspects of them.
This, added to the potential multi-valued nature of any identity attribute (how many phone numbers, email addresses, postal addresses etc does one have? Even something as simple as employer organisation can get messy, as Johannes states - I, as well as having my own job am listed as a director of another, completely unrelated, company) gives further complexity that should be considered in any global identity implementation.
Essentially, the identity-aspect will be determined by context - time and location become paramount in answering the question “Who am I?” (which is a precursor to the question “Who are you?” since the correct response to that is “Who’s asking?”)