[MEI-L] [mei-devel] Attribute default values

[Zoltan Komives]

Hi Andrew,


Thanks for your reply! Maybe it's not actually inconsistent, but here is an
example that's puzzling at first glance (from
Altenburg_concerto_C_major.xml<http://music-encoding.org/sampleCollection/encodings/Altenburg_concerto_C_major.xml>
):


<staffGrp>

  <staffGrp barthru="false" symbol="bracket">
    <staffDef n="2" label="Clarino 1-1.Chor" />
    <staffDef n="3" label="Clarino 2-1.Chor" />
    <staffDef n="4" label="Prinzipal-Chor 1" />
  </staffGrp>
  <staffGrp barthru="false" symbol="bracket">
    <staffDef n="5" label="Clarino 1-2.Chor"/>
    <staffDef n="6" label="Clarino 2-2.Chor"/>
    <staffDef n="7" label="Prinzipal-2.Chor"/>

  </staffGrp>
  <staffDef n="8" label="Timpani in C-G"/>
</staffGrp>


It seems it assumes @barthru=true as default since it only uses barthru
explicitly when the value is "false" - however, it wouldn't make much sense
to have @barthru true in the outer staff group and false in the inner staff
group; and the accompanying
.pdf<http://music-encoding.org/sampleCollection/encodings/Altenburg_concerto_C_major.pdf>proves
that the editor surely didn't mean to indicated that.


>Do you mean that it should be specified in the guidelines whether the
absence of

>@barthru means true or false by default?

Yes, that's what I meant, please see my answer re Thomas Weber's reply in
the following email!



Zoltan



P.S.: following Andrew's suggestion I am moving this discussion from
mei-devel to MEI-L





2013/6/21 Andrew Hankinson <andrew.hankinson at mail.mcgill.ca>

> Hi Zoltan,
>
> Could you give an example of how the @barthru attribute is inconsistently
> used? Do you mean that it should be specified in the guidelines whether the
> absence of @barthru means true or false by default? I think it's safe to
> assume that the absence of it is an implicit false value.
>
> Also, perhaps this discussion can be moved to the MEI-L mailing list?
>
> -Andrew
>
> On 2013-06-21, at 12:42 PM, Zoltan Komives <zoltan.komives at gmail.com>
>  wrote:
>
> Hi All,
>
> I am working on MEItoVexFlow <https://github.com/zolaemil/MEItoVexFlow>,
> a javascript library that renders music encoded in MEI onto HTML5 canvas.
> We will have to decide upon the default behaviour for certains attributes
> in case they are not present.
>
> We are going to define a customization for our particular application, but
> it raises the question whether there are some attributes that would benefit
> from a default value set by the guidelines.
>
> In particular, we've come across the @barthru attribute (*"indicates
> whether bar lines go across the space between staves (true) or are only
> drawn across the lines of each staff (false)."*). Its use is highly
> inconsistent across the sample encodings, and we think that maybe for this
> particular attribute we would gain more in consistency than the loss in
> flexibility.
>
> Please let me know what you think.
>
> Best wishes,
> Zoltan
>
>
> --
>
> Zoltan Komives
> GSoC Intern
> Maryland Institute for Technology in the Humanities
> http://mith.umd.edu/people/person/zoltan-komives/
> zoltan.komives at gmail.com
>
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