Remove attribute @measure_quantity
from <term/>
elements.
Before transformation:
<teiHeader>
<profileDesc>
<textClass>
<classCode/>
<keywords>
<term measure_quantity='1'>Term1</term>
<term measure_quantity='2'>Term2</term>
<term measure_quantity='4'>Term3</term>
</keywords>
</textClass>
</profileDesc>
</teiHeader>
After transformation:
<teiHeader>
<profileDesc>
<textClass>
<classCode/>
<keywords>
<term>Term1</term>
<term>Term2</term>
<term>Term3</term>
</keywords>
</textClass>
</profileDesc>
</teiHeader>