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<p class="MsoNormal">I think both these examples, polygon and polynomial generally deserve their own specific serialization.<o:p></o:p></p>
<p class="MsoNormal">I would not anticipate for example publishers mapping a polygon t some normalized representation, taking up multiple rows in multiple tables in a database.<o:p></o:p></p>
<p class="MsoNormal">And DB vendors generally support them using specialized types and serializations like geojson or WKT.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Is there no option doing something similar for these more complex mathematical expressions in the transformation model?<o:p></o:p></p>
<p class="MsoNormal">Could the parameter description language (<a href="http://ivoa.net/documents/PDL/20140523/REC-PDL-1.0-20140523.pdf">http://ivoa.net/documents/PDL/20140523/REC-PDL-1.0-20140523.pdf</a>) play a role there?<o:p></o:p></p>
<p class="MsoNormal">Or might something like the ANTLR calculator grammar (<a href="https://github.com/antlr/grammars-v4/blob/master/calculator/calculator.g4">https://github.com/antlr/grammars-v4/blob/master/calculator/calculator.g4</a>) be useful ?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Cheers<o:p></o:p></p>
<p class="MsoNormal">Gerard<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><b>From:</b> Patrick Dowler <pdowler.cadc@gmail.com> <br>
<b>Sent:</b> Monday, March 9, 2020 15:43<br>
<b>To:</b> Gerard Lemson <glemson1@jhu.edu><br>
<b>Cc:</b> CresitelloDittmar, Mark <mdittmar@cfa.harvard.edu>; Data Models mailing list <dm@ivoa.net><br>
<b>Subject:</b> Re: [vo-dml] Clarification on composition rule..<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-size:12.0pt">As you may know, I don't let the warning from vo-dml validation about open ended multiplicity bother me too much. Polynomial is another good example where it greatly limits/impacts how one might model something...
I ran into it way back at point, circle, polygon (oops! non-fixed size). I don't expect this can be feasibly made illegal in future... I expect the warning/admoinishment to be softened, maybe with some good advice about when such cardinality is warranted and
when another pattern may be a better choice.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt">my 2c,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt"><o:p> </o:p></span></p>
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<o:p></o:p></span></p>
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<p class="MsoNormal">--<o:p></o:p></p>
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<p class="MsoNormal">Patrick Dowler<o:p></o:p></p>
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<p class="MsoNormal">Canadian Astronomy Data Centre<o:p></o:p></p>
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<p class="MsoNormal">Victoria, BC, Canada<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On Mon, 9 Mar 2020 at 06:05, Gerard Lemson <<a href="mailto:glemson1@jhu.edu">glemson1@jhu.edu</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">HI Mark<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Just for now:<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">From the vo-dml spec:<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">“Modelers SHOULD NOT use open ended multiplicities, i.e. with maxOccurs=-1, but it is not illegal in the current version of this specification. "<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">indicates it is not illegal to use non-fixed size data type instances. (not that I like them as you know)<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">The fact that you think you need it here may be due to an incompleteness in the model as I described in my previous email.<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">It may well be that the structure of the mapping, including explicitly representation of what-is-mapped-to-what, could make the need for an explicit indication of forward vs inverse
redundant.<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">So looking forward to seeing more details of the model (and I can comment on another thread).<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Cheers<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Gerard<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">There are flavors which have open ended list of content<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> Lookup table has open ended list of Entries<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> Polynomials have open ended list of Coefficients, to avoid individually modeling the different order of polynomial functions.<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">DataTypes are supposed to have fixed size.<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Mark<o:p></o:p></p>
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