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In ResultList,
Package.has_patinfo? must be check Sequence#patinfo, Sequence#pdf_patinfo, Package#pdf_patinfo
Package.pdf_patinfo must return Package#pdf_patinfo, and if it is empty then return Sequence@pdf_patinfo
Package.package_patinfo? must be check Package#pdf_patinfo only.
Package#pdf_patinfo has prioriy over Sequence#patinfo and Sequence#pdf_patinfo.
