listofservers.dtd

SIP（Session Initiation Protocol）是由IETF定义

<!ELEMENT featureServers (serverType+)>
<!ELEMENT marshalServers (serverType+)>
<!ELEMENT jtapiServers (serverGroup*)>
<!ELEMENT redirectServers (serverGroup*)>
<!ELEMENT cdrServers (serverGroup*)>
<!ELEMENT pdpServers (serverGroup*)>

<!ELEMENT serverType (serverGroup*)>
<!ATTLIST serverType value CDATA #REQUIRED>

<!ELEMENT serverGroup (server+)>
<!ATTLIST serverGroup value CDATA #REQUIRED
                      displayGroup CDATA #IMPLIED
                      type ( calling | called ) #IMPLIED>

<!ELEMENT server EMPTY>
<!ATTLIST server host CDATA #REQUIRED
                 port CDATA #REQUIRED
>