definition_with_enum_interface.mtlx

<?xml version="1.0"?>
<materialx version="1.39">

  <!-- create a custom node that exposes an enumeration input via "interfacename" -->
  <nodedef name="ND_positionwrapper" node="positionwrapper">
    <input name="wrap_space" type="string" value="object" enum="model, object, world" uniform="true"/>
    <output name="out" type="vector3"/>
  </nodedef>
  <nodegraph name="NG_positionwrapper" nodedef="ND_positionwrapper">
    <position name="myPos" type="vector3">
      <input name="space" type="string" interfacename="wrap_space"/>
    </position>
    <output name="out" type="vector3" nodename="myPos"/>
  </nodegraph>

  <positionwrapper name="myPosWrapper" type="vector3">
    <input name="wrap_space" type="string" value="object"/>
  </positionwrapper>

  <extract name="extract" type="float">
    <input name="in" type="vector3" nodename="myPosWrapper"/>
    <input name="index" type="integer" value="1"/>
  </extract>
  <surface_unlit name="Srf" type="surfaceshader">
    <input name="emission" type="float" nodename="extract" />
  </surface_unlit>
  <surfacematerial name="Mtl" type="material">
    <input name="surfaceshader" type="surfaceshader" nodename="Srf" />
  </surfacematerial>
</materialx>