Required element SrcLayer or(eclusive) SrcSQL are required elements May be repeated Default to FALSE. Default to FALSE. Defaults to the value of "name" if not specified. Defaults to Direct. Only used if encoding = "WKT", "WKB" or "Shape" Only used if encoding = "PointFromColumns" Only used if encoding = "PointFromColumns" Only used if encoding = "PointFromColumns" Only used if encoding = "PointFromColumns". Defaults to TRUE. Only used if no Field element is found at the OGRVRTLayer level Defaults to FALSE. A valid WKT for a POLYGON May be repeated May be repeated May be repeated Defaults to Union if no Field element is speicified. May be repeated Defaults to FALSE.