[bookType]
  - id
  - available (Boolean)
  - isbn mandatory
  + title (titleType) = titleType mandatory
  + authors (authorsType) = authorsType mandatory
  + characters (charactersType) = charactersType mandatory

[authorType]
  - id
  - name mandatory
  - born (Date) mandatory
  - dead (Date)

[xs:anyType]
  orderable
  - * (undefined)
  + *
  + jcr:xmltext (jcr:Xmltext) = jcr:Xmltext multiple

[authorsType]
  orderable
  + author (authorType) = authorType multiple

[characterType]
  - id
  - name mandatory
  - born (Date) mandatory
  - qualification mandatory

[jcr:Xmltext]
  - jcr:xmlcharacters

[titleType]
  - lang
  - jcr:xmlContent

[libraryType]
  orderable
  + book (bookType) = bookType mandatory multiple

[charactersType]
  orderable
  + character (characterType) = characterType multiple