musicxml2ly does not recognize clef elements containing number attributes

[Patrick Schmidt]

Hey all,

here is a tiny example to demonstrate the issue: the musicxml2ly-conversion 
results in a common treble clef instead of a bass clef when the 
XML-clef-element contains a number attribute and a value, e.g. <clef 
number="1">. Without the number attribute everything works as expected. 
MusicXML allows number attributes in clef elements, so it's valid XML-code.

hth
patrick

P.S.: my first email probably got lost so I sent another one. Just in case: 
Sorry for double posting.

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!DOCTYPE score-partwise PUBLIC "-//Recordare//DTD MusicXML 3.0 Partwise//EN" 
"http://www.musicxml.org/dtds/partwise.dtd";>
<score-partwise>
  <identification>
    <miscellaneous>
      <miscellaneous-field name="description">This should be a bass clef, but 
when converted to LilyPond it becomes a common treble clef because musicxml2ly 
does not recognize the clef element when it contains a number attribute. (This 
is valid XML-Code as attributes.mod allows number attributes in clef 
elements.)</miscellaneous-field>
    </miscellaneous>
  </identification>
  <part-list>
    <score-part id="P1">
      <part-name>bass clef</part-name>
    </score-part>
  </part-list>

  <part id="P1">
    <measure number="1">
      <attributes>
        <divisions>1</divisions>
        <key>
          <fifths>0</fifths>
        </key>
        <time symbol="common">
          <beats>4</beats>
          <beat-type>4</beat-type>
        </time>
        <clef number="1">
          <sign>F</sign>
          <line>4</line>
        </clef>
      </attributes>
      <note>
        <pitch>
          <step>C</step>
          <octave>3</octave>
        </pitch>
        <duration>4</duration>
        <voice>1</voice>
        <type>whole</type>
      </note>
    </measure>
  </part>
</score-partwise>