Character interchange document: Basic DTD + XML, combined.

gistfile1.txt

<?xml version="1.0"?>
<!DOCTYPE character_interchange_document [
<!ELEMENT character_interchange_document (character+)>
<!ELEMENT character (character_name,playername,role)>
<!ELEMENT character_name (#PCDATA)>
<!ELEMENT playername (#PCDATA)>
<!ELEMENT role EMPTY>
<!ATTLIST role
              value (pc | npc) "pc"
]>

<character_interchange_document>
    <character>
         <character_name>harsk</character_name>
         <playername>bob</playername>
         <role value="npc"/>
    </character>
</character_interchange_document>