XML-VM

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An F2F soft-system is an XML virtual machine, since it presents a processing environment completely described by XML. Input, output and data storage are in XML. If the machine malfunctions, either due to hardware limitations (memory or disk full, etc) or due to programming errors, it should use valid XML to report this as an exception. As of October 2009, one issue is known which breaks this, the libXSLT <xsl:document> bug.

XML Virtual Machines

Name Location Last Modified Modular Script Description
F2F http://friend2friend.net Extended XSL 2010-03-13 Yes XSL/Xpath-based, suitable for Semantic Web
XCruciate http://xcruciate.co.uk Extended XSL 2009-07-15 Yes? Origins in VR!
XEPL http://freshmeat.net/projects/xepl XEPL 2008-02-08 No? Java style syntax