WIP on this branch

...upelec.edf.riseclipse.iec61850.nsd.edit/plugin.properties

...e/iec61850/nsd/provider/AgUnderlyingTypeItemProvider.java

...seclipse/iec61850/nsd/provider/BasicTypeItemProvider.java

...c61850/nsd/provider/ConstructedAttributeItemProvider.java

...eclipse/iec61850/nsd/provider/DataObjectItemProvider.java

...clipse/iec61850/nsd/provider/EnumerationItemProvider.java

...c61850/nsd/provider/ServiceDataAttributeItemProvider.java

...ipse/iec61850/nsd/provider/SubDataObjectItemProvider.java

...ntralesupelec.edf.riseclipse.iec61850.nsd/model/nsd.ecore

...alesupelec.edf.riseclipse.iec61850.nsd/model/nsd.genmodel

...supelec/edf/riseclipse/iec61850/nsd/AgUnderlyingType.java

...entralesupelec/edf/riseclipse/iec61850/nsd/BasicType.java

...lec/edf/riseclipse/iec61850/nsd/ConstructedAttribute.java

...tralesupelec/edf/riseclipse/iec61850/nsd/Enumeration.java

...ntralesupelec/edf/riseclipse/iec61850/nsd/NsdPackage.java

...df/riseclipse/iec61850/nsd/impl/AgUnderlyingTypeImpl.java

...pelec/edf/riseclipse/iec61850/nsd/impl/BasicTypeImpl.java

...iseclipse/iec61850/nsd/impl/ConstructedAttributeImpl.java

...c/edf/riseclipse/iec61850/nsd/impl/DataAttributeImpl.java

...elec/edf/riseclipse/iec61850/nsd/impl/DataObjectImpl.java