Different storage methods of different XML document types have been proposed. There are basically two types of XML documents, which are summarized as \"Document-centric\" and \"Data-centric\". Mostly native XML database is suit for \"Document-centric\" XML document and XML enabled database fits the others. This paper introduces designs for NXD and XED, and compares the different performance between them. A concept model of hybrid XML database has been put forward, and the feasibility and simple implementation is also mentioned in this paper.