有谁知道一个好的MAML编辑器

At work we use Sandcastle for creation of help files. I have been using SandCastleGUI for some time and I'm looking for a way to create additional pages in the help file. These pages are written in XML format called MAML. The only problem is that I couldn't find any decent editor for these file format.At work we use Sandcastle for creation of help