Learning XML

[Maat Mons]

Supposing I were trying to compile a parsable list of domains, would this be a good way to represent each one? 

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<domain>
   <type>planar</type>
   <name>Baator</name>
   <source>
      <date>2006-12</date>
      <title>Fiendish Codex II</title>
      <page>26</page>
   </source>
   <deity>
      <name>any archdevil</name>
      <source>
         <title>Fiendish Codex II</title>
         <page>26</page>
      </source>
   </deity>
   <requirement>Must be Lawful Evil.</requirement>
   <power>
      <type>su</type>
      <text>You gain the ability to see perfectly in darkness of any kind, even that created by a deeper darkness spell.
Add Bluff to your list of cleric class skills.</text>
   </power>
   <spell>
      <level>1</level>
      <name>Bane</name>
      <description>Enemies take –1 on attack rolls and saves against fear.</description>
   </spell>
   <spell>
      <level>1</level>
      <name>Disguise Self</name>
      <description>Changes your appearance.</description>
   </spell>
   <spell>
      <level>2</level>
      <name>Darkness</name>
      <description>20-ft. radius of supernatural shadow.</description>
   </spell>
   <spell>
      <level>2</level>
      <name>Fox’s Cunning</name>
      <description>Subject gains +4 to Intelligence for 1 minute/level.</description>
   </spell>
   <spell>
      <level>3</level>
      <name>Detect Thoughts</name>
      <description>Allows “listening” to surface thoughts.</description>
   </spell>
   <spell>
      <level>3</level>
      <name>Summon Monster III</name>
      <description>Calls extraplanar creature to fight for you.*</description>
   </spell>
   <spell>
      <level>4</level>
      <name>Deeper Darkness</name>
      <description>Object sheds supernatural shadow in 60-ft. radius.</description>
   </spell>
   <spell>
      <level>4</level>
      <name>Suggestion</name>
      <description>Compels subject to follow stated course of action.</description>
   </spell>
   <spell>
      <level>5</level>
      <name>Spell Resistance</name>
      <description>Subject gains SR 12 + level.</description>
   </spell>
   <spell>
      <level>5</level>
      <name>Summon Monster V</name>
      <description>Calls extraplanar creature to fight for you.*</description>
   </spell>
   <spell>
      <level>6</level>
      <name>Dominate Person</name>
      <description>Controls humanoid telepathically.</description>
   </spell>
   <spell>
      <level>6</level>
      <name>Fox’s Cunning, Mass</name>
      <description>As fox’s cunning, but affects one subject/level.</description>
   </spell>
   <spell>
      <level>7</level>
      <name>Repulsion</name>
      <description>Creatures can’t approach you.</description>
   </spell>
   <spell>
      <level>7</level>
      <name>Summon Monster VII</name>
      <description>Calls extraplanar creature to fight for you.*</description>
   </spell>
   <spell>
      <level>8</level>
      <name>Demand</name>
      <description>As sending, plus you can send suggestion.</description>
   </spell>
   <spell>
      <level>8</level>
      <name>Spell Turning</name>
      <description>Reflect 1d4+6 spell levels back at caster.</description>
   </spell>
   <spell>
      <level>9</level>
      <name>Imprisonment</name>
      <description>Entombs subject beneath the earth.</description>
   </spell>
   <spell>
      <level>9</level>
      <name>Summon Monster IX</name>
      <description>Calls extraplanar creature to fight for you.*</description>
   </spell>
   <note>* Lawful evil creatures only.</note>
</domain>

I there any problem if the text in a tag contains a line break? 

What tools would be good to use? 

A couple of things I might want to point out about how I structured the example.  I'd like to list all the sources, but only describe the most recent version.  I'd like each deity to have a corresponding source, since the fact that a given deity offers a given domain may only be noted in an obscure location.