Tools
   - In addition to display, you can check the syntax of an
       XML document.
 
   - You can use DTD (Data Type Definitions) and Schemas to
       define your XML tag set.  
 
   - Then you can write documents using the tag set.
 
   - This is a great way to work together, and share knowledge.
 
   - You can also use the DOM (document object model) to access
       XML documents (and other types or documents like HTML).
 
   - So, there is a lot of support for XML.