SRU::Request::Scan - A class for representing SRU scan requests

    ## creating a new request
    my $request = SRU::Request::Scan->new();

SRU::Request::Scan is a class for representing SRU 'scan' requests.

The constructor, which you can pass the parameters: version, scanClause responsePosition, maximumTerms, stylesheet, extraRequestData.

    my $request = SRU::Request::Explain->new( 
        version     => '1.1',
        scanClause  => 'horses',
    );

Fetch the root node of the CQL parse tree for the scan clause.