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.