public abstract class XPathExpression {
// Public Instance Properties
public abstract field string Expression{get; }
public abstract field XPathResultType ReturnType{get; }
// Public Instance Methods
public abstract method void AddSort(object expr,
System.Collections.IComparer comparer);
public abstract method void AddSort(object expr,
XmlSortOrder order, XmlCaseOrder caseOrder,
string lang, XmlDataType dataType);
public abstract method XPathExpression Clone();
public abstract method void SetContext(
System.Xml.XmlNamespaceManager nsManager);
}