I've got an XML document, with a DTD. Just to see what happens, I tried to make the XML incorrect, but no errors came up. Why would that be?

XML :
Code:
<?xml version="1.0"?>
<!DOCTYPE test SYSTEM "test.dtd">

<test>
<crap/><crap/><crap/>
</test>
test.dtd :
Code:
<!ELEMENT test (testelement)>
<!ELEMENT testelement (#PCDATA)>
From what I understand, I should be getting errors about the document or the dtd or something, but nothing is coming up as wrong.