eXist is an Open Source native XML database featuring efficient, index-based XQuery processing, automatic indexing, extensions for full-text search, XUpdate support, XQuery update extensions and tight integration with existing XML development tools. The database implements the current XQuery 1.0 working drafts, with exception of the schema import and schema validation features defined as optional in the XQuery specification.
eXist provides a powerful environment for the development of web applications based on XQuery and related standards. Entire web applications can be written in XQuery, using XSLT, XHTML, CSS and maybe Javascript (for AJAX functionality). XQuery server pages can be executed from the filesystem or stored in the database.
To avoid memory-intensive document tree traversals during query processing, eXist uses an efficient index structure which is based on a numerical indexing scheme for identifying XML nodes in the index.
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