Not sure the best place to report this, should i log it on github or is on this community site better. Just did a fresh install of OpenHab 2 and have this error when installing the RFXCOM binding:
2016-11-02 22:33:31.600 [WARN ] [ig.xml.osgi.XmlDocumentBundleTracker] - The XML document '/ESH-INF/thing/channels.xml' in module 'org.openhab.binding.rfxcom' could not be parsed: The document is invalid, it contains further unsupported data: [NodeValue [nodeName=description, value=Current temperature in degree Celsius], StateDescription [minimum=null, maximum=null, step=null, pattern=%.1f °C, readOnly=true, channelStateOptions=[]]]!
---- Debugging information ----
class : org.eclipse.smarthome.core.thing.xml.internal.ChannelTypeXmlResult
required-type : org.eclipse.smarthome.core.thing.xml.internal.ChannelTypeXmlResult
converter-type : org.eclipse.smarthome.core.thing.xml.internal.ChannelTypeConverter
path : /thing-descriptions/channel-type[15]
line number : 109
class[1] : java.util.ArrayList
converter-type[1] : com.thoughtworks.xstream.converters.collections.CollectionConverter
class[2] : org.eclipse.smarthome.core.thing.xml.internal.ThingDescriptionList
converter-type[2] : org.eclipse.smarthome.core.thing.xml.internal.ThingDescriptionConverter
version : 1.4.7
-------------------------------
com.thoughtworks.xstream.converters.ConversionException: The document is invalid, it contains further unsupported data: [NodeValue [nodeName=description, value=Current temperature in degree Celsius], StateDescription [minimum=null, maximum=null, step=null, pattern=%.1f °C, readOnly=true, channelStateOptions=[]]]!
---- Debugging information ----
class : org.eclipse.smarthome.core.thing.xml.internal.ChannelTypeXmlResult
required-type : org.eclipse.smarthome.core.thing.xml.internal.ChannelTypeXmlResult
converter-type : org.eclipse.smarthome.core.thing.xml.internal.ChannelTypeConverter
path : /thing-descriptions/channel-type[15]
line number : 109
class[1] : java.util.ArrayList
converter-type[1] : com.thoughtworks.xstream.converters.collections.CollectionConverter
class[2] : org.eclipse.smarthome.core.thing.xml.internal.ThingDescriptionList
converter-type[2] : org.eclipse.smarthome.core.thing.xml.internal.ThingDescriptionConverter
version : 1.4.7
-------------------------------
at org.eclipse.smarthome.config.xml.util.NodeIterator.assertEndOfType(NodeIterator.java:81)[97:org.eclipse.smarthome.config.xml:0.9.0.201610312128]
at org.eclipse.smarthome.core.thing.xml.internal.AbstractDescriptionTypeConverter.unmarshal(AbstractDescriptionTypeConverter.java:191)[106:org.eclipse.smarthome.core.thing.xml:0.9.0.201610312128]
at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:72)[97:org.eclipse.smarthome.config.xml:0.9.0.201610312128]
at com.thoughtworks.xstream.core.AbstractReferenceUnmarshaller.convert(AbstractReferenceUnmarshaller.java:65)[97:org.eclipse.smarthome.config.xml:0.9.0.201610312128]
at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:66)[97:org.eclipse.smarthome.config.xml:0.9.0.201610312128]
at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:50)[97:org.eclipse.smarthome.config.xml:0.9.0.201610312128]
at com.thoughtworks.xstream.converters.collections.AbstractCollectionConverter.readItem(AbstractCollectionConverter.java:71)[97:org.eclipse.smarthome.config.xml:0.9.0.201610312128]
at com.thoughtworks.xstream.converters.collections.CollectionConverter.addCurrentElementToCollection(CollectionConverter.java:98)[97:org.eclipse.smarthome.config.xml:0.9.0.201610312128]
at com.thoughtworks.xstream.converters.collections.CollectionConverter.populateCollection(CollectionConverter.java:91)[97:org.eclipse.smarthome.config.xml:0.9.0.201610312128]
at com.thoughtworks.xstream.converters.collections.CollectionConverter.populateCollection(CollectionConverter.java:85)[97:org.eclipse.smarthome.config.xml:0.9.0.201610312128]
at com.thoughtworks.xstream.converters.collections.CollectionConverter.unmarshal(CollectionConverter.java:80)[97:org.eclipse.smarthome.config.xml:0.9.0.201610312128]
at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:72)[97:org.eclipse.smarthome.config.xml:0.9.0.201610312128]
at com.thoughtworks.xstream.core.AbstractReferenceUnmarshaller.convert(AbstractReferenceUnmarshaller.java:65)[97:org.eclipse.smarthome.config.xml:0.9.0.201610312128]
at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:66)[97:org.eclipse.smarthome.config.xml:0.9.0.201610312128]
at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:50)[97:org.eclipse.smarthome.config.xml:0.9.0.201610312128]
at org.eclipse.smarthome.core.thing.xml.internal.ThingDescriptionConverter.unmarshal(ThingDescriptionConverter.java:48)[106:org.eclipse.smarthome.core.thing.xml:0.9.0.201610312128]
at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:72)[97:org.eclipse.smarthome.config.xml:0.9.0.201610312128]
at com.thoughtworks.xstream.core.AbstractReferenceUnmarshaller.convert(AbstractReferenceUnmarshaller.java:65)[97:org.eclipse.smarthome.config.xml:0.9.0.201610312128]
at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:66)[97:org.eclipse.smarthome.config.xml:0.9.0.201610312128]
at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:50)[97:org.eclipse.smarthome.config.xml:0.9.0.201610312128]
at com.thoughtworks.xstream.core.TreeUnmarshaller.start(TreeUnmarshaller.java:134)[97:org.eclipse.smarthome.config.xml:0.9.0.201610312128]
at com.thoughtworks.xstream.core.AbstractTreeMarshallingStrategy.unmarshal(AbstractTreeMarshallingStrategy.java:32)[97:org.eclipse.smarthome.config.xml:0.9.0.201610312128]
at com.thoughtworks.xstream.XStream.unmarshal(XStream.java:1185)[97:org.eclipse.smarthome.config.xml:0.9.0.201610312128]
at com.thoughtworks.xstream.XStream.unmarshal(XStream.java:1169)[97:org.eclipse.smarthome.config.xml:0.9.0.201610312128]
at com.thoughtworks.xstream.XStream.fromXML(XStream.java:1115)[97:org.eclipse.smarthome.config.xml:0.9.0.201610312128]
at com.thoughtworks.xstream.XStream.fromXML(XStream.java:1062)[97:org.eclipse.smarthome.config.xml:0.9.0.201610312128]
at org.eclipse.smarthome.config.xml.util.XmlDocumentReader.readFromXML(XmlDocumentReader.java:82)[97:org.eclipse.smarthome.config.xml:0.9.0.201610312128]
at org.eclipse.smarthome.config.xml.osgi.XmlDocumentBundleTracker$1.processBundle(XmlDocumentBundleTracker.java:129)[97:org.eclipse.smarthome.config.xml:0.9.0.201610312128]
at org.eclipse.smarthome.config.xml.osgi.AbstractAsyncBundleProcessor$1.run(AbstractAsyncBundleProcessor.java:231)[97:org.eclipse.smarthome.config.xml:0.9.0.201610312128]
at java.lang.Thread.run(Thread.java:745)[:1.8.0_111]