public CommonProperties(
XElement element,
CommonAttributes attributes,
Extension<EvaluationContextResolver> contextResolver)
: base(element)
{
Contract.Requires<ArgumentNullException>(element != null);
Contract.Requires<ArgumentNullException>(contextResolver != null);
this.attributes = attributes;
this.contextResolver = contextResolver;
this.context = new Lazy<XPathExpression>(() =>
!string.IsNullOrEmpty(attributes.Context) ? contextResolver.Value.Context.CompileXPath(element, attributes.Context) : null);
}