|
|
| (5 intermediate revisions by 2 users not shown) |
| Line 1: |
Line 1: |
| − | == Notice == | + | == Versions == |
| | | | |
| − | This is a working draft document.
| + | * [[Discovery Cast Atom Response Format v1.1]] ([[Discovery Change Proposal-1 | DCP-1]], currently open for voting) |
| − | | |
| − | | |
| − | == Introduction ==
| |
| − | | |
| − | At the NASA Earth Science Data System Working Group meeting in New Orleans on October 21, 2010, a proposal was made to expand the scope of Federated search to cover Discovery more generally, thus bringing into the fold datacasting and servicecasting. Therefore a common Atom response format is needed that extends the [http://www.ietf.org/rfc/rfc4287.txt Atom Syndication Format (RFC 4287)] with extensions specific for Earth science data usage.
| |
| − | | |
| − | == Namespace ==
| |
| − | | |
| − | TODO. esip? others?
| |
| − | | |
| − | == rel links ==
| |
| − | | |
| − | Currently, the supported ''rel'' links of "http://esipfed.org/ns/discovery/1.1/cast_type#" where "cast_type" is of one of the following values:
| |
| − | | |
| − | * ''data''
| |
| − | ** Data Casting Granules. OpenSearch Granules response
| |
| − | * ''collection''
| |
| − | ** Data Casting Collection. Not for OpenSearch Collection response which uses OSDD instead.
| |
| − | * ''service''
| |
| − | ** Service Casting
| |
| − | * ''event''
| |
| − | ** natural phenomenon
| |
| − | * ''feed''
| |
| − | ** feed of various feeds
| |
| − | * ''browse''
| |
| − | ** browse image
| |
| − | * ''documentation''
| |
| − | ** arbitrary documentation
| |
| − | * ''metadata''
| |
| − | ** data and collection metadata
| |
| − | | |
| − | The ''rel'' links shall have types. Currently, there are no constraints on allowed types. Though a mime-type is highly recommended.
| |
| − | | |
| − | === Example ===
| |
| − | <pre>
| |
| − | <link href="http://host.com/my/file.nc" length="64959344" rel="http://esipfed.org/ns/discovery/1.1/data#" title="Granule File" type="application/x-netcdf" />
| |
| − | </pre>
| |
| − | | |
| − | == Geo extensions ==
| |
| − | | |
| − | Similar to the [http://www.opensearch.org/Specifications/OpenSearch/Extensions/Geo/1.0/Draft_1 OpenSearch Geo extension]. Use the "geo" namespace for defining box, radius, and polygon regions for each entry.
| |
| − | | |
| − | === Example ===
| |
| − | <pre>
| |
| − | <geo:box>-180.0 -90.0 180.0 90.0</geo:box>
| |
| − | </pre>
| |
| − | | |
| − | == Time extensions ==
| |
| − | | |
| − | Similar to the [http://www.opensearch.org/Specifications/OpenSearch/Extensions/Time/1.0/Draft_1 OpenSearch Time extension]. Use the "time" namespace for defining time start and end for each entry. vallues for times must be in [http://en.wikipedia.org/wiki/ISO_8601 ISO 8601] string format.
| |
| − | | |
| − | === Example ===
| |
| − | <pre>
| |
| − | <time:start>2005-01-01T00:00:00Z</time:start>
| |
| − | <time:end>2005-01-01T03:00:00Z</time:end>
| |
| − | </pre>
| |
| − | | |
| − | == Custom tag extensions ==
| |
| − | | |
| − | Domain-specific tags can be added with namespace at the top-level of <entry> tags.
| |
| − | | |
| − | === Example ===
| |
| − | | |
| − | <pre>
| |
| − | <entry>
| |
| − | ...
| |
| − | <gesdisc:dayNightFlag>day</gesdisc:dayNightFlag>
| |
| − | ...
| |
| − | </entry>
| |
| − | </pre>
| |
| − | | |
| − | == Example ESIP Discovery Atom response ==
| |
| − | | |
| − | An example of an Atom discovery response feed:
| |
| − | <pre>
| |
| − | <?xml version="1.0" encoding="UTF-8"?>
| |
| − | <feed xmlns="http://www.w3.org/2005/Atom"
| |
| − | xmlns:opensearch="http://a9.com/-/spec/opensearch/1.1/"
| |
| − | xmlns:georss="http://www.georss.org/georss">
| |
| − | <title>Granules</title>
| |
| − | <updated>2010-12-13T18:30:02Z</updated>
| |
| − | <author>
| |
| − | <name>A NASA Center</name>
| |
| − | </author>
| |
| − | <id>urn:uuid:00000000-0000-0000-0000000000</id>
| |
| − | <opensearch:totalResults>100000</opensearch:totalResults>
| |
| − | <opensearch:startIndex>0</opensearch:startIndex>
| |
| − | <opensearch:itemsPerPage>10</opensearch:itemsPerPage>
| |
| − | <entry>
| |
| − | <title>regrid-modis.aqua-avg.1hr.p5deg-v1.0-2005.01.01.blk1.nc</title>
| |
| − | <link href="http://host.com/my/file.nc" length="64959344" title="Granule File" type="application/x-netcdf" />
| |
| − | <link href="http://host.com/my/file.nc" length="64959344" rel="http://esipfed.org/ns/discovery/1.1/data#" title="Granule File" type="application/x-netcdf" />
| |
| − | <geo:box>-180.0 -90.0 180.0 90.0</geo:box>
| |
| − | <time:start>2005-01-01T00:00:00Z</time:start>
| |
| − | <time:end>2005-01-01T03:00:00Z</time:end>
| |
| − | <updated>2008-12-16T15:00:26Z</updated>
| |
| − | </entry>
| |
| − | </feed>
| |
| − | </pre>
| |
| − | | |
| − | == Pagination Support ==
| |
| − | | |
| − | TODO. Should we follow something like the [http://www.opensearch.org/Specifications/OpenSearch/1.1#OpenSearch_response_elements OpenSearch convention for pagination]? Pagination stats would be under the "opensearch" namespace. rel links to other pages contain precomputed links to the other paged feeds.
| |
| − | | |
| − | === Example ===
| |
| − | <pre>
| |
| − | <feed>
| |
| − | ...
| |
| − | <link href="http://host/to/this/feed" rel="self" />
| |
| − | <link href="http://host/to/first/page/feed" rel="first" />
| |
| − | <link href="http://host/to/next/page/feed" rel="next" />
| |
| − | <link href="http://host/to/last/page/feed" rel="last" />
| |
| − | <opensearch:totalResults>1000000</opensearch:totalResults>
| |
| − | <opensearch:startIndex>0</opensearch:startIndex>
| |
| − | <opensearch:itemsPerPage>10</opensearch:itemsPerPage>
| |
| − | ...
| |
| − | </feed>
| |
| − | </pre>
| |
