SRU::Request::SearchRetrieve - A class for representing SRU searchRetrieve requests
## creating a new request my $request = SRU::Request::SearchRetrieve->new( version => '1.1', query => 'kirk and spock' );
The constructor which you can pass the following parameters: version, query, startRecord, maximumRecords, recordPacking, recordSchema, recordXPath, resultSetTTL, sortKeys, stylesheet, extraRequestData. The version and query parameters are mandatory.
Fetch the root node of the CQL parse tree for the query.