Each request made contains metadata about the request in the header of the response. This information includes the URI, the string that was queried, the format requested and other information:
| Key | Description | Format | Multiplicity |
|---|---|---|---|
| uri | The Unique Resource Identifier of this result. | char | 1 |
| query | The query string, decoded. | char | 1 |
| format | The requested format. | char | 1 |
| dataset | The datasets requested. | char | 1 |
| maxresults | The maxresults requested. | integer | 0..1 |
| offset | The offset requested. | integer | 0..1 |
| totalresults | The total number of results found (may be more than returned). | integer | 1 |
| lr | The language requested. | char | 0..1 |
| epoch | A version reference for the Data product. | char | 1 |
| filter | The fq parameter(s) and their value(s) requested. | char | 0..1 |
| output_srs | The output spatial reference system. | char | 1 |
| srs | The projection the geospatial search coordinates are in. Only returned for Nearest, BBox and Radius resources. | char | 0..1 |