NAME
      Catmandu::Importer::CrossRef - Package that imports data form CrossRef.
      Take an existing DOI and lookup the metadata for it.

SYNOPSIS
      use Catmandu::Importer::DOI;

      my %attrs = (
        doi => '<doi>',
        usr => '<your-crossref-username>',
            pwd => '<your-crossref-password>',
            format => '<xsd_xml | unixref | unixsd | info>'
      );

      my $importer = Catmandu::Importer::DOI->new(%attrs);

      my $n = $importer->each(sub {
        my $hashref = $_[0];
        # ...
      });

SEE ALSO
    Catmandu::Iterable, Catmandu::Importer