<#pat> <#child> [ <#age> "4" ] , [ <#age> "3" ].
Note:
- Words used as IDs have no actual meaning.
- Unnamed nodes can't be used elsewhere.
- Ig things are names, make the name explicit
[ <#name> "Pat"; <#age> "24"; <#eyecolor> "blue" ].
[ <#name> "Al" ; <#age> "3"; <#eyecolor> "green" ].
[ <#name> "Jo" ; <#age> "5"; <#eyecolor> "green" ].
