[oslc-core] Add oslc:modifiedBy to Core Vocabulary

[Arthur Ryman]

dcterms: defines dcterms:created and dcterms:creator. It also defined 
dcterms:modified, but NOT dcterms:modifiedBy. This has led to some 
implementations using dcterms:contributor and some defined their own 
modifiedBy term.

The OSLC Core spec specifies that dcterms:modified as follows:

Timestamp last latest resource modification 

We should therefore define oslc:modifiedBy in the OSLC Core vocabulary, to 
pair up with dcterms:modified.

dcterms:contributor should be used as a multi-valued propoerty to indicate 
the people who contributed to the resource, not just the person who last 
modified it.

Regards, 
___________________________________________________________________________ 

Arthur Ryman 

DE, PPM & Reporting Chief Architect
IBM Software, Rational 
Toronto Lab | +1-905-413-3077 (office) | +1-416-939-5063 (mobile)