AutoCAD schema Xdata seq datavalue seq seq AutoCAD entity base class id Acad layer Acad Colour xdata AutoCAD 3d polyline line width is first and last points the same AutoCAD hatched polygon A network test Layer class A layer test property A network test class A network test property A parent network node test class A network node test class A speed property A network link test class A speed property A layer test property A network test Layer class A layer test property A network test property A network test class A network test property A parent network node test class A speed property A network node test class A speed property A network link test class Electrical schema Thomas Edison electic base class Acad entity location and shape metres transformer.dll start_transformer voltage yes A, B or C type name type name point location pole shape sits on pole A network test Layer class A layer test property A network test class A network test property A parent network node test class A network node test class A speed property A network link test class A speed property A layer test property A network test Layer class A layer test property A network test property A network test class A network test property A parent network node test class A speed property A network node test class A speed property A network link test class A network test property A network test property A network test class A network test property