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# uSCXML ReadMe
uSCXML is a SCXML interpreter written in C/C++. It is [mostly feature-complete](https://github.com/tklab-tud/uscxml#test-reports)
as far as the W3C SCXML draft specifies. It runs on <b>Linux</b>, <b>Windows</b> and <b>MacOSX</b>, each 32- as well as 64Bits.
There is no technical reason for it not to run on iOS and Android as well, but we did not yet setup
the respective build-process and did not precompile required libraries.
* <b>Datamodels</b>
* ECMAScript using Google's v8 and JavaScriptCore (JSC is incomplete)
* Prolog using SWI prolog
* NULL datamodel with required <tt>In</tt> predicate
* <b>No</b> XPath datamodel yet
* <b>Invokers</b>
* <tt>scxml</tt>: Invoke a nested scxml interpreter
* <tt>dirmon</tt>: Watches a directory for changes to files
* <tt>scenegraph</tt>: Simplified 3D scenegraphs with custom markup
* <tt>heartbeat</tt>: Periodically sends events
* <tt>umundo</tt>: Subscribe to channels and publish events
* <b>DOM</b>
* DOM Core Level 2 + XPath extensions available for ecmascript datamodel
* Namespace aware to embed custom markup for special invokers
* <b>Communication</b>
* Features the standard basichttp io-processor
* Features the required SCXML io-processor
* <b>No</b> DOM io-processor yet
* Can actually respond to HTTP requests with data via <response>
* <b>Language Bindings</b>
* PHP module for apache and cli interpreter
## Test Reports
We continuously run the [W3C IRP tests](http://www.w3.org/Voice/2013/scxml-irp/) for SCXML. The results the for
various platforms can be [found here](http://uscxml.tk.informatik.tu-darmstadt.de/cdash/index.php?project=uscxml).
There are a few [excluded tests](https://github.com/tklab-tud/uscxml/blob/master/contrib/ctest/CTestCustom.ctest.in)
regarding the <tt>XPath</tt> datamodel and the manual tests.
uSCXML still fails the following tests:
<table>
<tr><th>Test#</th><th>Status</th><th>Description</th><th>Comment</th></tr>
<tr>
<td><tt><a href="https://github.com/tklab-tud/uscxml/blob/master/test/samples/w3c/ecma/test301.scxml">301</a></tt></td>
<td><tt>Failed</tt></td>
<td>"the processor should reject this document because it can't download the script"</td>
<td>uSCXML continues processing as if there was no <tt><script></tt> element.</td>
</tr>
<tr>
<td><tt><a href="https://github.com/tklab-tud/uscxml/blob/master/test/samples/w3c/ecma/test329.scxml">329</a></tt></td>
<td><tt>Failed</tt></td>
<td>"test that none of the system variables can be modified"</td>
<td>uSCXML allows writing to <tt>_event</tt>. This is very useful to have a scope
that vanishes when processing an event is finished.</td>
</tr>
<tr>
<td><tt><a href="https://github.com/tklab-tud/uscxml/blob/master/test/samples/w3c/ecma/test346.scxml">346</a></tt></td>
<td><tt>Failed</tt></td>
<td>"test that any attempt to change the value of a system variable causes error.execution to be raised"</td>
<td>Same issue as above: we allow writing to <tt>_event</tt>.</td>
</tr>
<tr>
<td><tt><a hreaf="https://github.com/tklab-tud/uscxml/blob/master/test/samples/w3c/ecma/test488.scxml">488</a></tt></td>
<td><tt>Failed</tt></td>
<td>"test that illegal expr in <param> produces error.execution and empty event.data"</td>
<td>The actual meaning of <emph>empty</emph> is still ambiguous - in test 343 it is assumed to be <tt>undefined</tt>.</td>
</tr>
</table>
## License
uSCXML itself is distributed under the Simplified BSD license as in, do not sue us and do
not misrepresent authorship. Please have a look at the licenses of the [libraries we depend
upon](https://github.com/tklab-tud/uscxml/blob/master/docs/BUILDING.md#build-dependencies) as well.
## Download
We do not yet feature installers. Please download the source and have a look at the [build
instructions](https://github.com/tklab-tud/uscxml/blob/master/docs/BUILDING.md).
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