anchor.diff:  
   open System
   open System.IO
  +open System.Net
   open System.Reflection
   
   module CT = ContentTypes
  
positive.code:         this.Write(">")
  
      member this.WriteEncodedText(text: string) =
          this.Write(encodeText text)
          
      member this.AddAttribute(name: string, value: string) =
          currentAttributes.Add(struct (name, value))
  
  
negative.code:         this.WriteAttribute(name, value, false)
  
      member this.WriteAttribute(name: string, value: string, encoded: bool) =
          this.Write(" {0}=\"", name)
          WebUtility.HtmlEncode(value, w)
          this.Write("\"")
  
  #endif
  
  