public void v7()
{
XmlSchemaSet sc = new XmlSchemaSet();
XmlSchema Schema1 = sc.Add(null, TestData._XsdAuthor);
XmlSchema Schema2 = sc.Add(null, TestData._XsdAuthor);
Assert.Equal(sc.Count, 1);
Assert.Equal(Schema1 != null, true);
// the second call to add should be ignored with Add returning the first obj
Assert.Equal(Schema2, Schema1);
return;
}