[MEI-L] symbol/symbolDef

[Johannes Kepper]

maybe we discovered another spot in MEI where including SVG might be helpful…?
jo

Am 19.03.2012 um 11:20 schrieb TW:

> 2012/3/18 Roland, Perry (pdr4h) <pdr4h at eservices.virginia.edu>:
>> Hi, Thomas,
>> 
>> The <symbolDef> element is intended to allow the inclusion of arbitrary symbols/signs.  Using <symbolDef>, one can say how a symbol should be drawn in terms of its graphic components; that is, text, curves, and lines. After defining the symbol's coordinate space (using @ulx, @uly, @lrx, and @lry), the <anchoredText>, <curve>, and <line> elements (with appropriate x, y, x2, and y2 attributes) can be used to construct the symbol.
>> 
>> The <symbol> element can then be used to make reference to this user-defined sign.
>> 
>> For example, one could define a new sign within <scoreDef> --
>> 
>> <scoreDef>
>>  <symbolTable>
>>    <symbolDef xml:id="mySign" ulx="0" uly="0" lrx="20" lry="20">
>>      <line x="10" y="0" x2="10" y2="10"/>
>>      <line x="10" y="10" x2="20" y2="10"/>
>>      <line x="20" y="10" x2="20" y2="20"/>
>>    </symbolDef>
>>  </symbolTable>
>> </scoreDef>
>> 
>> then later in the document data invoke this symbol --
>> 
>> <measure>
>>  <staff n="1">
>>    <layer>
>>      <note xml:id="n1" .../>
>>        ...
>>    </layer>
>>  </staff>
>>  <symbol ref="mySign"/>
>> </measure>
>> 
>> <symbolDef> may contain references to other <symbol> elements.  If a line of a certain length and style is a common component, it can be defined once and re-used.
>> 
>> The symbol can be placed relative to elements in the notation (using some combination of ho, vo , and to attributes) --
>> 
>> <symbol startid="n1" ho="5"/>
>> 
>> (This example indicates the symbol is placed at the same vertical position as, but 5 half-step units above, n1.)
>> 
>> <symbol> and <symbolDef> cannot be used to point to a feature in a facsimile image because they have no @facs attribute.  This was done purposefully in order to encourage the use of elements of the notation; that is, <note>, <chord>, <staff>, etc., for this purpose.
>> 
>> <annot> can be used to record commentary on symbols just as it can with other elements of notation.  It's technically possible make a <symbolDef> element a target (using @plist), but I think <symbol> is the proper target.  In other words, <symbol> is a generic placeholder for an "unknown" notational sign.  <symbolDef> is "just" the instructions for drawing it.
>> 
> 
> I see, so the module is meant for rendering purposes only.  Then
> <symbol> inside <symbolDef> is intended for "composite" symbols,
> right?  <curve> and <line> elements would obviously describe the
> strokes to create a symbol.  I think I can make up some examples for
> the guidelines.  But for defining decent symbols, <curve> and <line>
> seem pretty crude to me, especially because they can only describe
> lines and not filled areas.
> 
> I'll think about this.
> 
> Thomas
> 
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