From FMS: Forces Modeling and Simulation Handout JSU HPC Summer Institute for Undergraduates, Jackson MS -- June 15 1998. byWojtek Furmanski, Subhash Nair, Tom Pulikal
<!ELEMENT library (name,films,film)
<!ELEMENT name (#PCDATA)>
<!ELEMENT films (#PCDATA)>
<!ELEMENT film (#PCDATA)>
where (#PCDATA) denotes that the tags that are to be used are Characters tags only.