What do URLs "mean": tei-c.org

Source

Does anybody besides me find this bizarre:

http://www.tei-c.org/index.xml

gets you:


<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">


http://www.tei-c.org/index.xml?style=raw

gets you:


<?xml version="1.0" encoding="UTF-8"?>
<?oxygen RNGSchema="http://www.tei-c.org/cms/system/modules/org.tei.www/_common/schemas/teilite.rnc" type="compact"?>
<TEI xmlns="http://www.tei-c.org/ns/1.0" rend="home">


http://www.tei-c.org/index.xml?style=printable

gets you:


<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">


Why not:

http://www.tei-c.org/index.html
http://www.tei-c.org/index.xml
http://www.tei-c.org/index-printable.html


or some such (in which filename extensions actually bear some relationship to what the user gets, rather than the hidden underlying format or application/file hierarchy on the server) -- and thus throughout the whole website.