FW: Pondering EMIX Product Descriptions

Redirecting onto the list
From:
Ed Cazalet [mailto:]
Sent:  Monday, May 30, 2011 9:27 AM
To:  'Toby Considine'; 'William Cox'; 'Anne Hendry'
Subject:  Pondering EMIX Product Descriptions

Toby, Ann – nice job updating wd24 – big improvements.
http://www.oasis-open.org/committees/download.php/42353/emix-1-0-spec-wd24_5_wchanges.pdf

On reading the update (line numbers from link above) I am pondering the following:

Line 521:

The abstract Product Description Type is the basis for all static descriptions of EMIX
products. Product Descriptions are static in that they refer to a particular instance in
time.

Line 531:
The Item Base is the basis for the lowest level description of each Product and its
aspects.


Line 730:
Items do not include quantity or price. The same Item definition may be used in
every transactive state, and prices and quantities are not known for all.

Line 1403:
Item Base: Abstract base class for units for EMIX Product delivery,
measurement, and warrants. Item does not include Quantity or Price, because a
single product description or transaction may have multiple quantities or prices
associated with a single item.


My questions are:

What is special about price and quantity that they should not be in the Product Description ?  In fact some prices and quantities are included in Product Description

For example : strike price in EMIX Option Type (see diagram line 672)

Power:unitEnergyPrice at line 833 and 838
                          Full Requirements Power Price at line 848
                          Resource Offer Segment at Line 1014 Table 10 – Price and Units (a quantity)

Line 758: Table 7:
An EMIX ProductDescription describes the energy or
services, the location and the price and quantity variables
that can be set as a default in the Gluon and inherited by
the Intervals in the Sequence. With the possibility of
lineage of multiple gluons, product description in the
interval, this is not required.

This says a Product Description includes the price and quantity, yet they are also separately called out in Table 7.  Why?


Just trying to understand, clarify and simplify, if possible.

Edward G. Cazalet, Ph.D.
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