After digging through your CHM file and looking at MS Project's Xml file format, I noticed an entry in the XML file called "AvailabilityPeriods" and a class in the Aspose.Tasks.XML namespace with the same name.  However, when loading an Aspose.Tasks.XML.XmlFile, the AllResources method still returns instances of Aspose.Tasks.Resource and not Aspose.Tasks.XML.Resource.  That doesn't make much sense to me.  How can I get to the AvailabilityPeriods in my reference MPP/Xml project file?