Usage of nsIXPointerSchemeContext Interface

 Evaluate.

 @param aDocument The document in which to resolve the XPointer.
 @param aContext  The XPointer context in which to process aData.
 @param aData     The data in the scheme that needs to be resolved.
 @return          The result of the evaluation.

nsIXPointerResult evaluate(in nsIDOMDocument aDocument, in nsIXPointerSchemeContext aContext, in DOMString aData)