<!-- gueterzug.dtd -->
<!ELEMENT gueterzug (lokomotive) (waggon)+>
<!ELEMENT lokomotive (name?, lok_id, ps)>
<!ELEMENT waggon (name?, waggon_id, klasse, reservation)>
<!ELEMENT name (#PCDATA)>
<!ELEMENT lok_id (#PCDATA)>
<!ELEMENT ps (#PCDATA)>
<!ELEMENT waggon_id (#PCDATA)>
<!ELEMENT klasse (#PCDATA)>
<!ELEMENT reservation (#PCDATA)>