Added a new directory to work on version 4.0 of SDT.

SDT/schema4.0/docs/images/Doc.png

SDT/schema4.0/docs/images/Domain.png

SDT/schema4.0/docs/images/Event.png

SDT/schema4.0/docs/images/MC.Action.DataPoint.Event.png

SDT/schema4.0/docs/images/MC.Action.DataPoint.png

SDT/schema4.0/docs/images/ModuleClass.png

SDT/schema4.0/docs/images/Property.png

SDT/schema4.0/docs/images/SDT3.0_UML.png

SDT/schema4.0/docs/images/SDT_UML_Basic_Elements.png

SDT/schema4.0/docs/images/SDT_UML_DataType.png

SDT/schema4.0/docs/images/SDT_UML_Key.png

SDT/schema4.0/docs/images/SDT_simplified.png

SDT/schema4.0/docs/images/SimpleType.png

SDT/schema4.0/docs/images/Struct.png

SDT/schema4.0/docs/images/SubDevice.png

SDT/schema4.0/docs/images/TypeChoice.png

SDT/schema4.0/etc/XInclude.xsd

SDT/schema4.0/etc/XMLSchema-datatypes.xsd

SDT/schema4.0/etc/XMLSchema.dtd

SDT/schema4.0/etc/XMLSchema.xsd