Gets the number of logical XML Schema definition language (XSD) schemas in the System.Xml.Schema.XmlSchemaSet.
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If there are two schemas for the namespace http://www.contoso.com in the System.Xml.Schema.XmlSchemaSet, the XmlSchemaSet.Count property would return 1 because the schemas are treated as a single logical schema for validation purposes. However, if a schema for the namespace http://www.contoso.com/retail imported a schema for the http://www.contoso.com/books namespace, the value of the XmlSchemaSet.Count property would be 2.