Example for PurgeStaging Activity

<Activity Name="PurgeStaging">
  <Action>PurgeStaging</Action>
  <Description lang="en">Purge Staging Data</Description>
  <Parameter direction="in" type="string" eval="constant"    name="eventState">PURGE</Parameter>
  <Parameter direction="in" eval="xpath" type="string" name="MasterCatalog"   source="/Message/Body/Document/BusinessDocument/CatalogAction/CatalogActio  nHeader/MasterCatalog/RevisionID/BaseName/text()">inDoc</Parameter>
  <Parameter direction="in" eval="xpath" type="string" name="CatalogInputMap"   source="/Message/Body/Document/BusinessDocument/CatalogAction/CatalogActio  nHeader/MasterCatalog/InputMap/RevisionID/BaseName/text()">inDoc
  </Parameter>
  <Parameter direction="in" name="InDocument" type="document"   eval="variable">inDoc</Parameter>
  <Parameter direction="in" name="AsynProcessIndicator" type="boolean"   eval="constant">false</Parameter>
</Activity>