Re: [seul-edu] Eduml proposal (the documennt)

[Eric Sandeen <sandeen@jump.net>]

>This look good but why not using ref. to existing <scale> element.
>I took some of your ideas for the mapping.
>For exemple:
>
><scale scaleId="unique scale identifier">     <!-- performance arithmetic -->
>  <scaleSchema> a paragraph explaining this marking schema </scaleSchema>
>  <scaleMath high="high" low="low" type="relative or absolute">
>   mathematical algorithm to use</scaleMath>
>  <scaleMatrix> an array of permissible marks if finite </scaleMatrix>
></scale>
>
>
>We can define a common scale based on float value from -100 to 100 for
>exemple. But this is more application specific as Eduml doesn't do any
>computation. In the case of a numeric scale we just need to compute an
>affine transformation using the low and high value. With a discret
>scale we can supply a mapping to the common scale.  Scale are quite
>common toward session, so it's ok to defined them outside of the
>session

I'm not so sure that the scale would be the same across classes in a 
session - imagine a school which has remedial classes and advanced 
classes.  The advanced classes may have a different (more difficult) 
grading scale...  I think we will run into problems unless we allow scales 
to be defined for each unique class.

><scales>
>  <commonScale>
>   <high>100.0</high>
>   <low>0.0</low>
>  </commonScale>
>
>  <scale scaleId="over100">
>   <numeric type="???">
><!-- FIXME Should we say if we use int, float, flaten to the 1/2,... ? -->

I think we should always allow floats for numeric marks.  People can still 
enter whole numbers if they want to.

>    <high>100</high>
>    <low>0</low>
>   <numeric>
>  <scale>

<snip>

>Should we add weight to class, course and session ?

I don't know of any reason to do this - I can't think of a situation where 
grades for a class would be averaged across a course, for example.  I think 
assignment and category weights are enough (these are the only items which 
affect a _student grade_.)

-Eric

p.s. it's looking good, I think.  :)