The Drs URL query parameter sets an EQL filter for a dimension search.

This filter restricts the scope of the records that will be considered for a dimension search. Only dimension values represented on at least one record satisfying the filter are returned as search results.

Note the following about the Drs parameter:

Because the Drs syntax is identical to that of Nrs, you can use the various EQL requests that are documented earlier in this section.

The following example illustrates a dimension search query using an EQL filter:

N=0&D=novel&Drs=collection()/record[author_deceased = "false"]

The query uses the D parameter to specify novel as the search term, while the Drs parameter sets a filter for records in which the author_deceased property is set to false (that is, records of deceased authors).