Static method that determines whether the specified XML schema contains a custom IsDataSet attribute set to true, or its equivalent.
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true if the specified schema exists; otherwise, false.
The IsDataSet attribute comes from the namespace urn:schemas-microsoft-com:xml-msdata.
The XmlSchemas.IsDataSet(System.Xml.Schema.XmlSchema) method is called by the .NET Framework's XML serialization infrastructure and does not need to be called directly.