r well understood terminologies, but this is an ongoing area of development</li>
 <li>It is at the discretion of the server how much validation to perform, but most servers offer the same services as or even use the common validators.
   Some servers also offer <a href="#web">a web interface</a></li>
</ol>

<p>
Note that all these validation methods are incomplete; they 
can only validate the computable aspects of conformance. There are always 
additional rules made in narrative that they are not ab