public void TestParseQuantity()
        {
            var i    = new Model.Quantity(3.14m, "kg", "http://mysystsem.org");
            var node = i.ToTypedElement();
            var p    = node.ParseQuantity();

            Assert.True(p.IsExactly(i));
        }
        public void TestParseBindableQuantity()
        {
            var iq   = new Model.Quantity(4.0m, "kg", system: null);
            var node = iq.ToTypedElement();
            var c    = node.ParseBindable() as Coding;

            Assert.NotNull(c);
            Assert.Equal(iq.Code, c.Code);
            Assert.Equal("http://unitsofmeasure.org", c.System);  // auto filled out by parsebinding()
        }