DTD being ignored?

I set up a dtd but the xml parser seems to be ignored. I have fields
that are set to be required and others that are set to be straight
character data (CDATA). If I remove the required field the the parse
should fail, but doesn't. Also, the parser is trying to parse the cdata
fields. I know this because if I create the xml with <![CDATA[my
data]]>, instead of relying on the dtd, the fields go through just fine.

My DTD looks like this:
<!DOCTYPE webSync [

<!ELEMENT webSync (transaction+)>
<!ATTLIST webSync syncID CDATA #REQUIRED>
<!ATTLIST webSync nbTrans CDATA>

<!ELEMENT transaction (syncItem, tname, compID?, actionCD, data?, pk?)>
<!ELEMENT syncItem (#CDATA)>
<!ELEMENT tnam     (#CDATA)>
<!ELEMENT compID   (#CDATA)>
<!ELEMENT actionCD (#CDATA)>
<!ELEMENT data     (#CDATA)>
<!ELEMENT pk       (#CDATA)>

]>

The opening of my xml looks like this:
<?xml version="1.0" encoding="iso-8859-1"?>
<!DOCTYPE webSync PUBLIC "-//Bene-Care Inc//Website syncronization//EN"
"http://192.168.100.5/dtd/webSync.dtd">

Am I doing something wrong here?

Josh