rec-csymbol2

csymbol as a function space

<math xmlns="http://www.w3.org/1998/Math/MathML">
  <apply>
    <csymbol definitionURL="http://www.example.org/function_spaces.html#my_def" encoding="text">BigK</csymbol>
    <ci>x</ci>
    <ci>y</ci>
  </apply>
</math>

Author: MathML 2 Recomendation