a: a client makes an HTTP request; a webserver receives it
b: the security layers of the web app validate the request
c: the TWINE Validator begins buffering the output of the web app
d: the application logic executes, generating HTML dynamically
e: the TWINE validator writes the dynamically-generated HTML output to a static file;
into the dynamic output the validator writes a link that will submit the static file to an
online validation service
f: an outside validation service (such as the W3C HTML validator) can now access the static HTML