SQLite Xtra is free SQL-capable database xtra. It's based on the open source database engine "SQLite", which is also used by commercial xtras like Arca Xtra and MelixDB Xtra (so database files are exchangeable!). SQLite implements most of the SQL92 standard. (for details and documentation see http://www.sqlite.org/)
SQLite Xtra uses a naming convention for it's basic database functions that is similar to the PHP implementation of SQLite. In addition it has a couple of utilitiy functions for embedding/retrieving binary data (binary strings, external files, arbitrary cast members) into/from a database.
Some interesting features of SQLite xtra are its support of using arbitrary lingo functions (so called User Defined Functions, UDFs) inside SQL statements, and its support of registering callback functions for queries.
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