The following example updates a document by setting the ad hoc parameter AC_KEEP_WORKSPACE_DIRECTORY to Yes. This setting preserves the workspace directory after the document runs. Because IsAdHoc is True, ColumnName and ColumnType are required parameters. They apply only to ad hoc parameter definitions. ColumnName is the database column to which the parameter applies. ColumnType is the data type of the column. ColumnType can be any Actuate data type, such as Boolean, Double, and Integer. ColumnName and ColumnType are parameters of ParameterDefinition.