Document Type Definition - level 1
<!-- Tag for the whole catalogue -->
<!ELEMENT catyear - - (admdata | intro | (nrpar | nrcomm | unmarked | #PCDATA)+)>
<!-- Administrative data (info about file, not the catalogue) -->
<!-- Introduction to the volume -->
<!-- Numberparagraph -->
<!ELEMENT nrpar - O ((catnr+,shared?,(artefdata | subnrkomm)+,shared?)>
<!-- Number comment, information concerning one or several numbers -->
<!-- Unmarked paragraph -->