Abstract: Based on the semi-structured characters of electronic medical record document, the article constructs the XML electronic medical record document. For a large calculation of the original multi-signature, and how to make meaningful subdocuments, on the basis of the Wu’signature algorithm, the article improves the multi-signature algorithm, by optimizing the signature rules. It solves problem of the signature efficiency and evaluates the multisignature. Based on the structure features of XML electronic medical record, the article constructs the medical keywords index database which makes a meaningful decomposition of the subdocument. Based on XML-signature specification, the article realizes the new multi-signature scheme, and the expansibility can be obtained to some extent.

Key words: eXtensible Markup Language, electronic medical record, subdocument, multi-signature