Question about special symbols in XML

When writing xml configuration today, one of the strings contains & characters and the result is incorrect:

The reason is that XML and HTML are the same. This type of special symbols must be used with escape characters...

The final solution is like this:

 <  Add  Key  =  "  Format  "  Value  =  "  Http: // {0}/gettile. ashx? Type = China & Amp;  Format = PNG  & Amp;  Quadkey = {quadkey}  "  /> 

For other special symbols, record them later.

Reference: http://www.cnblogs.com/HardChen/archive/2010/11/16/1878254.html