DTD validation?

[wxdqz]

<?xml version="1.0" encoding="ISO-8859-1"?><!DOCTYPE system [<!ELEMENT system (FunctionBlock)+ ><!ELEMENT FunctionBlock (NotifiableProperties, Exclusions*) ><!ELEMENT NotifiableProperties (Property*) ><!ELEMENT Property EMPTY ><!ATTLIST Property Name CDATA #IMPLIED><!ELEMENT Exclusions (Function*) ><!ELEMENT Function (#PCDATA) >]><system><FunctionBlock><NotifiableProperties><Property Name="Mute"/><Property Name="CCConferenceCall"/><Property Name="Notification_Set"/><Property Name="Notification"/><Property Name="PhoneEnable"/></NotifiableProperties><Exclusions><Function>GetInterface</Function><Function>Interface</Function></Exclusions></FunctionBlock></system>