[MEI-L] @loc vs. @pname (and @oct)

[Roland, Perry D. (pdr4h)]

This kind of thing can't be enforced by a DTD, RNG, or XSD schema -- @loc has to be optional for when @pname is used and vice versa.  Therefore, both have to be optional, which in turn means they can appear at the same time.  Schematron is designed to handle "co-constraints"; that is, context-dependent rules, such as "If @loc, then not @pname".  Of course, this assumes that there's no circumstance where both @loc and @pname are needed at the same time, which I'm not absolutely sure we can predict.  MEI's designed to handle situations like this through customization; that is, if your project can say absolutely "never @loc and @pname simultaneously", then you can create an RNG that enforces that rule.  But, you can't make everyone else abide by it.

--
p.

__________________________
Perry Roland
Music Library
University of Virginia
P. O. Box 400175
Charlottesville, VA 22904
434-982-2702 (w)
pdr4h (at) virginia (dot) edu
________________________________________
From: mei-l [mei-l-bounces at lists.uni-paderborn.de] on behalf of Byrd, Donald A. [donbyrd at indiana.edu]
Sent: Friday, March 10, 2017 5:12 PM
To: Music Encoding Initiative
Subject: Re: [MEI-L] @loc vs. @pname (and @oct)

Enforcing it via schemas is exactly what I had in mind. So you're saying, maybe eventually, and I gather it's only practical via Schematron, but don't hold my breath :-) . No problem. Thanks for the info.

--DAB


On Mar 10, 2017, at 9:37 AM, "Roland, Perry D. (pdr4h)" <pdr4h at eservices.virginia.edu> wrote:

>
> Hi Don,
>
> Indeed, attribute values can contradict each other, but there's no other way to offer different encoding approaches.  The basic solution to this problem is to avoid double encoding; that is, only one of @loc or @pname should be used.  Eventually, we may get around to enforcing this approach via Schematron.
>
> --
> p.
>
>> -----Original Message-----
>> From: mei-l [mailto:mei-l-bounces at lists.uni-paderborn.de] On Behalf Of Byrd,
>> Donald A.
>> Sent: Thursday, March 09, 2017 9:59 PM
>> To: Music Initiative Encoding
>> Subject: [MEI-L] @loc vs. @pname (and @oct)
>>
>> It seems that @loc and @pname are valid together, at least against mei-
>> Mensural and therefore (I assume) against any schema that includes Mensural.
>> This does not seem like a good thing, since they can easily contradict each
>> other! And @loc can also contradict @oct.
>>
>> --Don
>>
>>
>> ---
>> Donald Byrd
>> Woodrow Wilson Indiana Teaching Fellow
>> Adjunct Associate Professor of Informatics Visiting Scientist, Research
>> Technologies Indiana University Bloomington
>>
>>
>>
>>
>>
>>
>>
>> _______________________________________________
>> mei-l mailing list
>> mei-l at lists.uni-paderborn.de
>> https://lists.uni-paderborn.de/mailman/listinfo/mei-l
> _______________________________________________
> mei-l mailing list
> mei-l at lists.uni-paderborn.de
> https://lists.uni-paderborn.de/mailman/listinfo/mei-l

---
Donald Byrd
Woodrow Wilson Indiana Teaching Fellow
Adjunct Associate Professor of Informatics
Visiting Scientist, Research Technologies
Indiana University Bloomington







_______________________________________________
mei-l mailing list
mei-l at lists.uni-paderborn.de
https://lists.uni-paderborn.de/mailman/listinfo/mei-l