Silverlight 5 WinRT

  public class XPathMessageContextMarkupExtension
  : MarkupExtension
  public Dictionary`2<String, String> Namespaces { get; }
  public virtual Object ProvideValue(IServiceProvider serviceProvider);

  public class XPathMessageContextTypeConverter
  : TypeConverter
  public virtual Boolean CanConvertFrom(ITypeDescriptorContext context, Type sourceType);
  public virtual Boolean CanConvertTo(ITypeDescriptorContext context, Type destinationType);
  public virtual Object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, Object value);
  public virtual Object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, Object value, Type destinationType);