<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n\
<!-- Diameter services DTD -->\n\
\n\
-<!ELEMENT services (stack*, node*)>\n\
+<!ELEMENT services ((stack*, node*)|(node*, stack*))>\n\
\n\
<!ELEMENT stack EMPTY>\n\
<!ATTLIST stack id CDATA #REQUIRED dictionary CDATA #REQUIRED validationMode (BeforeEncoding | AfterDecoding | Always | Never) #IMPLIED validationDepth (Complete | FirstError) #IMPLIED fixMode (BeforeEncoding | AfterDecoding | Always | Never) #IMPLIED ignoreFlagsOnValidation (yes | no) #IMPLIED>\n\