OGS
python_error_source_term.xml
<OpenGeoSysProjectDiff base_file="../1d_decay_chain_GIA.prj">
  <add sel="/*">
    <python_script>python_error_source_term.py</python_script>
  </add>
  <add sel="//process_variable[name='pressure']">
    <source_terms>
      <source_term>
        <type>Python</type>
        <source_term_object>st</source_term_object>
        <mesh>1d_decay_chain_ReactiveDomain</mesh>
      </source_term>
    </source_terms>
  </add>
</OpenGeoSysProjectDiff>