The name of the Workspace under which the source should be retrieved. This workspace is created at the start of a download, and deleted at the end. You can normally omit the property unless you want to name a workspace to avoid conflicts on the server (i.e. when you have multiple projects on one server talking to a Team Foundation Server)
The default value is to create a workspace named Hudson-${JOB_NAME}. The ${JOB_NAME} will be replces with the name of the job. ${USER_NAME} will be replaced with the user name that the Hudson server is running as.