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eXist-db is a feature rich Open Source native XML database
eXist-db is a native XML database featuring efficient, index-based XQuery processing, extensions for keyword search, XUpdate support, XSLT support, XForms support, REST and tight integration with existing XML development tools. Moved to Github - https://www.github.com/exist-db/exist
Busilet is a reference implementation of IDTP and UTID.
...The IDTP (Identifier Tracing Protocol) is a communication protocol to access the information of a thing that identified by UTID. The IDTP and UTID were designed by the author of the Busilet project in recent three years. For more information, see:
https://datatracker.ietf.org/doc/draft-huangng-idtp/
https://datatracker.ietf.org/doc/draft-huangng-utid/
Project Busilet is a reference implementation of IDTP that provides a set of APIs developers to develop IDTP server and IDTP client software. Busilet4j is written in Java language and is for Java programmer to develop IDTP server and IDTP client software.
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CalDAV sync for Android
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Stopped working on it. Doesn't make any sense to spend more time on it; I recommend e.g. DAVdroid as an opensource and ready-to-use solution on clientside.
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For code look at:
https://github.com/e7o-de/android.caldav