With the popularity of XML technology and Native XML database, efficiently indexing, and retrieving XML data in Native XML database become a important research topic. This paper proposes a keyword-based query solution for Native XML database. An inverted index for XML documents in Native XML database is constructed firstly, and Dewey code is taken as the unique identify of the elements in XML documents. Then a query interface is designed on the basis of inverted index; query interface accepts a set of keywords from user, and then automatically generates executable FLWOR expression; finally FLWOR expression is sent to XQuery engine which is the important component of Native XML database system. XQuery engine performs query on Native XML database, then sends user a set of XML data which meets user's requirement. The solution discussed in this paper provides support for effective and convenient query on Native XML database, and would promote further applications based on Native XML database.
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