[om] the USE of <OMOBJ>

[Manfred Riem]

I second the suggestion, just so you all know ;)

Manfred.


> -----Original Message-----
> From: owner-om at openmath.org [mailto:owner-om at openmath.org] On 
> Behalf Of Michael Kohlhase
> Sent: Friday, November 07, 2003 7:16 AM
> To: om at openmath.org
> Subject: Re: [om] the USE of <OMOBJ>
> 
> 
> Ernesto,
> 
> If you agree, then I will present this suggestion at the workshop in 
> your name. Then we can discuss this and send you feedback.
> 
> Michael
> 
> Reinaldo Barreiro, E. wrote:
> 
> > Dear all,
> > 
> > I would like to bring the following issue to the mailing list.
> > 
> > Why is the <OMOBJ> tag needed in the XML encoding of 
> OpenMath objects?
> > 
> > I would like <OMOBJ> be declare as optional. Why?
> > 
> > 1-There is always a unique child of <OMOBJ>. So, all the information
> >   <OMOBJ> holds can be also attributed to its unique child. For 
> > instance, <OMOBJ id="bla">
> >    <OMA>
> >         ...
> >    </OMA>
> > </OMOBJ>
> > could be as well written as
> > <OMA id="bla">
> >     ...
> > </OMA>.
> > No information is lost (as far as I can see).
> > 
> > 2-For the creation of interactive documents <OMOBJ> brings all
> >   kind of problems. Consider the following hypothetical JSP 
> >   code fragment
> > 
> > --------------------------------------------------------------
> > <c:set name="a">
> >     <OMOBJ>
> >         <OMV name="A"/>
> >     </OMOBJ>
> > </c:set>
> > 
> > <c:set name="b">
> >     <OMOBJ>
> >         <OMV name="B"/>
> >     </OMOBJ>
> > </c:set>
> > 
> > Let <inlineequation><c:out name="a"/></inlineequation> and 
> >     <inlineequation><c:out name="b"/></inlineequation> be
> > 
> > ...
> > 
> > We compute
> > <equation>
> >     <OMOBJ>
> >         <OMA>
> >             <OMS cd="arith1" name="plus"/>
> >             <c:out name="a"/>
> >             <c:out name="b"/>
> >         </OMA>
> >     </OMOBJ>
> > </equation>
> > ......
> > -----------------------------------------------------------------
> > 
> > Here a and b are string variables containing the XML 
> encoded openmath 
> > objects. Clearly, in <inlineequation><c:out 
> > name="a"/></inlineequation> we get a "valid" OpenMath 
> object, but in 
> > the last expression, involving <c:out name="a"/> and <c:out 
> name="b"/> 
> > we will have to find a way to get rid of the <OMOBJ> in 
> order to get a 
> > valid openmath object. This "problem" disappear either if 
> we get rid 
> > of the <OMOBJ> or if we allow it to appear in more than one 
> place in 
> > an OpenMath object.  Previous example is very simplistic 
> and is easy 
> > to get things working but in more realistic example is not 
> always easy 
> > to get things to work properly.
> > 
> > So, what I'm asking is either to remove <OMBOJ>
> > <OMA>
> >   <OMS cd="arith1" name="plus"/>
> >   <OMV name="A"/>
> >   <OMV name="B"/>
> > </OMA>
> > or to allow XML enoced objects like the following:
> > <OMOBJ>
> > 	<OMA>
> >             <OMS cd="arith1" name="plus"/>
> >             <OMOBJ>
> > 		<OMV name="A"/>
> > 	    </OMOBJ>
> >             <OMOBJ>
> > 		<OMV name="B"/>
> > 	    </OMOBJ>
> > 	</OMA>
> > </OMOBJ>
> > I would favor the first "solution". 
> > 
> > Best regards,
> > 
> > Ernesto Reinaldo Barreiro.
> > --
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> -- 
> --------------------------------------------------------------
> -----------
>     Prof. Dr. Michael Kohlhase,         Office: Research 1, Room 62
>     Professor for Computer Science      Campus Ring 12,
>     School of Engineering & Sciences    D-28758 Bremen, Germany
>     International University Bremen     tel/fax: +49 421 200 3140/3103
>     http://www.cs.cmu.edu/~kohlhase     e-mail: 
> <m.kohlhase at iu-bremen.de>
> --------------------------------------------------------------
> ------------
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> om at openmath.org  -  general discussion on OpenMath
> Post public announcements to om-announce at openmath.org
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> 


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