Interface definition for a command listed in a TCD file any set of elements defined in XML schema. XML document with root element Parameters to be passed to Command by DCA Consumer any set of elements defined in XML schema. XML document with root element Responses to be passed by Command to DCA Consumer TesLA Completion Code per lookup table referenced in spec delimited list of URIs to log files created by this command vendor-specific completion code vendor-specific completion message with any useful information desired optional - should match name of associated file in TCD file