8.BizTalk special character in XML beginning, EF,BB,BF, PreserveBOM

Some of our clients report that, there are receive our XML file with a special character at the beginning of each file.

Then I try to open the file in Visual Studio, XML Spy, notepad, it looks fine, no spcecial character over there.

 

 

But if I open it in Ultra Edit or Compared It, I can see there is really a special character over there, view it as binary mode; you can see that the special character is EF BB BF

Then I go to check other XML file send out by BizTalk, all within this special character, I’m very surprised in it. Although it will not cause any errors, but some client’s application cannot recognize this special character and cause some errors.

After an hour investigation, I found that there is a property configuration –PreserveBOM in the XML send pipeline, it is “true” by default, if we configure it to “false”, the special character “EF BB BF” will not present anymore.