anchor.diff:              header: h3 Fragments
               .properties
   
  -                - array = group.fragment
  +                - array = group.fragment || []
                   for i in array
                       +defTerm(null, 'Fragment')
                           a(href=i.identifier) #{i.identifier}
                           +linkOrPlain(i.roleLink)
                               |  (#{i.roleLabel})
   
  -                - array = group.namedFragment
  +                - array = group.namedFragment || []
                   for i in array
                       +defTerm(null, 'Named fragment')
                           a(href=i.identifier) #{i.label}
  
positive.code:             header: h3 Identification Data
              .properties
  
                  - array = group.identifier
                  for i in array
                      +defTerm(null , 'Identifier')
                          a(href=i.identifierLink) #{i.identifierLink}
  
                  - array = group.title
                  for i in array
                      +defTerm(null, 'Title')
                          +linkOrPlain(i.typeLink)
                              |  (#{i.typeLabel})
  
                  - array = group.language
                  for i in array
                      +defTerm(null, 'Language')
                          +linkOrPlain(i.languageLink)
                              | #{i.languageLabel}
  
                  - array = group.locator
                  for i in array
                      +defTerm(null, 'Link')
                          a(href="#{i.locatorLink}") #{i.locatorLink}
  
negative.code:     - empty[3] = { propertyName: 'locator', locatorLink: '-' }
      - empty[4] = { propertyName: 'contributor', contributorLink: '-', contributorLabel: '-', roleLabel: '-', roleLink: '-'}
      - empty[5] = {propertyName: 'creator', creatorLink: '-', creatorLabel: '-', roleLabel: '-', roleLink: '-' }
      - empty[6] = {propertyName: 'date', date: '-', typeLabel: '-', typeLink: '-'}
      - empty[7] = {propertyName: 'location', latitude: '-', longitude: '-', altitude: '-', coordinateSystemLink: '-', coordinateSystemLabel: '-', locationLink: '-', locationLabel: '-'}
      - empty[8] = {propertyName: 'description', descriptionLabel: '-'}
      - empty[9] = {propertyName: 'keyword', keywordLabel: '-', keywordLink: '-'}
  