Query Results and Catalogue Items

When a query is executed in ECHO, it automatically generates a Result. Every Result in ECHO has a unique identifier within the system called a ResultSetID A catalog item is any orderable item (granule or collection) in the ECHO system. Retrieving results of a query to ECHO may return several granules or collections, but not all the granules or collections may be orderable. If a granule or collection is orderable, a CatalogItemID (an XML tag in the ECHO DTD) is returned for the granule or collection metadata. Currently ECHO catalog item ID is in a format like "G123456-GSFC". Every catalog item ID consists of two parts. The first part starts with a capital letter, either a "G" which represents a granule item, or a "C" which represents a collection item. The numerical ID immediately follows the capital letter. The second part is the name of the provider. Two parts are linked with a dash “-”.