result = new PropContainsExpression (e, getRequestedResourcePool());
else if (namespace.equals (NamespaceCache.SLIDE_URI)
&& name.equals (Literals.NOT_PROPCONTAINS))
result = new NotPropContainsExpression (e, getRequestedResourcePool());
else
throw new InvalidQueryException
("operator <" + namespace + ":" + name + "> is an unprocessable entity");