<macroSpec ident="data.BEAM" module="MEI" type="dt">
<desc>Beam attribute values: initial, medial, terminal. Nested beaming is permitted.</desc>
<content>
<rng:data type="token">
<rng:param name="pattern">[i|m|t][1-6]</rng:param>
</rng:data>
</content>
</macroSpec>