 <OpenGeoSysProjectDiff>

   <add pos="after" sel=".//time_loop/output/prefix/text()">_neumann</add>

   <replace sel=".//parameters/parameter[2]/name/text()">p_neumann</replace>

   <replace sel=".//parameters/parameter[3]/name/text()">p_Dirichlet</replace>

   <replace sel=".//parameters/parameter[3]/value/text()">1</replace>

   <replace sel=".//process_variables/process_variable/boundary_conditions/boundary_condition[1]/parameter/text()">p_Dirichlet</replace>

   <replace sel=".//process_variables/process_variable/boundary_conditions/boundary_condition[2]/type/text()">Neumann</replace>

   <replace sel=".//process_variables/process_variable/boundary_conditions/boundary_condition[2]/parameter/text()">p_neumann</replace>

   <add pos="after" sel=".//process_variables/process_variable/boundary_conditions/boundary_condition[1]">

     <boundary_condition>

       <geometrical_set>square_1x1_geometry</geometrical_set>

       <geometry>bottom</geometry>

       <type>Dirichlet</type>

       <parameter>p_Dirichlet</parameter>

     </boundary_condition>

   </add>

 </OpenGeoSysProjectDiff>