BQ with Meta-data.. (Was: Re: Decomposition (Was: Re: Philosophy of basic Q (Was: Re: [QUANTITY] Data Model for Quantity v0.5

[Brian Thomas]

On Wednesday 12 May 2004 04:05 am, Pierre Didelon wrote:
> Hi Brian,
>
> some details which I don't understand,
> may be related once more to document contradiction?

	Yes. You have a good eye for details.  See below.
>
> Brian Thomas wrote:
> > 	David,
>
> snip
>
> > 	What I am suggesting is that the higher dimensional Q's (core, standard)
> > 	be allowed to be "decomposed" into a set of basic Q's which hold the
> > equivalent information. In code, this looks like :
> >
> > 	List decomposedBasicQList = standardQ.decompose();
> >
> > 	In terms of the equivalence principle in the meta-data/data, it is best
> > 	explained via example. Take a standard Quantity with a coordinate
> > 	description, say Counts(x_pixel) ("counts as a function of x_pixel
> > quantity):
> >
> > 	<quantity name="counts">
> > 		<metaData>
> > 			<quantity name="obs
> > time"><units>hr</units><string/><value>3:00</value></quantity> <axes>
> > 			<quantity name="x_pixel"><units>pixel</units><integer
> > width="1"/><values>0 1 2</values></quantity> </axes>
> > 		<units>cnts</units>
> > 		<float width="4" precision="1"/>
> > 		<values>10.2 39.8 40.5</values>
> > 	</quantity>
> >
> > 	has the equivalent description in basic Q's (abbreviated the node name
> > to "bq") as:
> >
> > 	<!-- the first pixel as bq -->
> > 	<bq name="counts">
> > 		<metaData>
> > 			<bq name="obs time"><units>hr</units><string/><value>3:00</value></bq>
> > 			<bq name="x_pixel"><units>pixel</units><integer
> > width="1"/><value>0</value></quantity> </metaData>
> > 		<units>cnts</units>
> > 		<float width="4" precision="1"/>
> > 		<value>10.2</value>
> > 	</bq>
>
> In Doc. MetaData is "related" to CoreQuantity level,
> so does the above example be allowed in this case?

	Yes, I would have that BasicQ should have the ability to have meta-data.
	I had thought that this was in the document, but I guess its not.

> But may be your are using xsd files (which I read through xsd schema)
> which seems to allow optionnal metadata at every levels!
> I don't understand the relation of xsd file and graph. with document!

	What is "graph"?? I assume you mean the example in the email above?
	Please clarify so I can answer.

	Thanks again for the error/contradiction spotting.

	=b.t.


>
> Pierre

-- 

  * Dr. Brian Thomas 

  * Dept of Astronomy/University of Maryland-College Park 
  * Code 630.1/Goddard Space Flight Center-NASA

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