Character interchange document: Basic DTD + XML, with and without attributes

CharacterInterchangeFormat_noAttributes.dtd

<?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 (#PCDATA)>
]>

<character_interchange_document>
    <character>
         <character_name>harsk</character_name>
         <role>npc</role>
         <playername>bob</playername>
    </character>
</character_interchange_document>

CharacterInterchangeFormat_withAttributes.dtd

<?xml version="1.0"?>
<!DOCTYPE character_interchange_document [
<!ELEMENT character_interchange_document (character+)>
<!ELEMENT character EMPTY>
<!ATTLIST character
	name CDATA #REQUIRED
	playername CDATA #REQUIRED
    role (pc | npc) "pc"
>
]>

<character_interchange_document>
    <character name="harsk" role="npc" playername="bob"></character>
    <character name="valeros" role="npc" playername="bill"></character>
</character_interchange_document>

Perhaps we can combine the two: https://gist.github.com/2172980