HTTP::OAI::UserAgent - Extension of the LWP::UserAgent for OAI
    HTTP requests
This module provides a simplified mechanism for making requests to
    an OAI repository, using the existing LWP::UserAgent module.
        require HTTP::OAI::UserAgent;
        my $ua = new HTTP::OAI::UserAgent;
        my $response = $ua->request(
                baseURL=>'http://arXiv.org/oai1',
                verb=>'ListRecords',
                from=>'2001-08-01',
                until=>'2001-08-31'
        );
        print $response->content;
  - $ua = new HTTP::OAI::UserAgent(proxy=>'www-cache',...)
- This constructor method returns a new instance of a HTTP::OAI::UserAgent
      module. All arguments are passed to the LWP::UserAgent constructor.
- $r = $ua->request($req)
- Requests the HTTP response defined by $req, which
      is a HTTP::Request object.
- $r = $ua->request(baseURL=>$baseref, verb=>$verb, %opts)
- Makes an HTTP request to the given OAI server (baseURL) with OAI
      arguments. Returns an HTTP::Response object.
    OAI-PMH related options:         from => $from
        until => $until
        resumptionToken => $token
        metadataPrefix => $mdp
        set => $set
    
- $time_d = $ua->delay( $time_d )
- Return and optionally set a time (in seconds) to wait between requests.
      $time_d may be a CODEREF.