ELEMENTS:
----------------------------
  Name: personnel
  Content Model: (person)+

  Name: person
  Content Model: (name,email*,url*,link?)
  Attributes:
    Name:id, Type: ID

  Name: name
  Content Model: (#PCDATA|family|given)*

  Name: email
  Content Model: (#PCDATA)

  Name: url
  Content Model: EMPTY
  Attributes:
    Name:href, Type: CDATA

  Name: link
  Content Model: EMPTY
  Attributes:
    Name:manager, Type: IDREF(S)
    Name:subordinates, Type: IDREF(S)

  Name: family
  Content Model: (#PCDATA)

  Name: given
  Content Model: (#PCDATA)