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PROV-ISSUE-187: Section 5.2.2 (PROV-DM as on Nov 28) [prov-dm]

From: Provenance Working Group Issue Tracker <sysbot+tracker@w3.org>
Date: Wed, 07 Dec 2011 01:53:47 +0000
To: public-prov-wg@w3.org
Message-Id: <E1RY6hf-0007I5-7X@tibor.w3.org>

PROV-ISSUE-187: Section 5.2.2 (PROV-DM as on Nov 28) [prov-dm]


Raised by: Satya Sahoo
On product: prov-dm

The following are my comments on Section 5.2.2 of the PROV-DM as on Nov 28th 2011.

Section 5.2.2:
1. "attributes: a set of attribute-value pairs [ attr1=val1, ...], representing other attributes of this activity that hold for its whole duration."
"an activity record's attribute remains constant for the duration of the activity it represents."

Comment: I have raised this issue before - why does the attribute values of an activity have to hold for its whole duration? Why is this constraint necessary or enforceable? 
If emailing is an activity a0 with attribute "status", then how do we represent [status="composing text"], [status="uploading attachment"], [status="sending"], and [status="sent"]?
In addition, what does "duration" of activity mean - the time when it is "active" or between its "start event" and "end event"? What about "paused event"? 

2. "The attribute type is a reserved attribute of PROV-DM, allowing for subtyping to be expressed."

Comment: Exact definition of "type" is absent?


Received on Wednesday, 7 December 2011 01:53:48 UTC

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