|To:||"Gary Berg-Cross" <gary.berg-cross@xxxxxxxx>|
|Cc:||"[ontolog-forum] " <ontolog-forum@xxxxxxxxxxxxxxxx>|
|From:||"Barker, Sean (UK)" <sean.barker@xxxxxxxxxxxxxx>|
|Date:||Tue, 24 Jun 2008 09:09:06 +0100|
The concept of product identity has been much discussed in the product support world. Briefly, the conclusions are:
1) Anything can have multiple identifiers, each assigned by different organizations, and it is required that each organization ensure the identifiers in its context are unique.
2) Things are identified by identifier, defining organization identifier, and the identifier of the organization that that provides the organization identifier (three of these are recognised, CAGE Code, Dunn and Bradstreet and the European equivalent).
3) It may be necessary to classify identifiers as "preferred", "mandatory" etc, so that identification does not become mangled in a round trip through someone's system - and it implies that systems must therefore be able to maintain multiple identifiers.
4) In the aircraft industry, an individual component must maintain an identity throughout its life - this is complicated by the way that products are identified by product type and serial number; remanufacturing means that the product type (which is a classification code) becomes invalid.
5) Unique identifiers may include version, variant and iteration codes (see 8 below).
6) Compounds of simple products are essentially arbitrary, and tracking identifiers are decided by convention. For example, a typical pc is a configuration of hardware and software that changes over time. In big corporations, a network is a constantly changing configuration of nodes, connections and software. But, as Cardinal Newman observed, Rome is still Rome, even though most of the original has been rebuilt or replaced several times.
7) Most complex system are defined by multiple views, each being a set of independently changing configurations of subsystems in the same view, some of which may not resolve down to the level of a real individual thing. E.g. the requirement X123: The product will have a mean time to failure of 10,000 hours. (Requirements are viewed as part of the product).
8) Identify management is one component of configuration management. Consequently, the concept of identity is defined by the industrial processes that manage identity. Therefore, industries with different identification management processes will have different concepts of what is meant by identity.
One notes also:
9) SOA architectures are low level infrastructure architectures, which are (by design) neutral to the industrial processes that use them. Consequently, SOAs have nothing to say about identity management of things other than for components of the SOA.
10) EU projects, such as Trustcom have looked at the technical challenges of building chains of trust over an SOA. I don't know that they looked at the business issues. I have been investigating certification of the use of SOAs under the SIMDAT EU project. Since most of the important certification processes (eg ISO 9000, EN/AS 9004 for quality, OAIS and EN 9300 for long term maintainability of data, BIP 0008 for evidential weight) and methodologies (e.g. SABSA for security) require physical audit of the organizations involved, the problem of building a trusted identity management service will be interesting.
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