gistfile1.txt

<!ELEMENT people (lecturers, students)>

<!ELEMENT lecturers (lecturer+)>
<!ELEMENT students (student+)>

<!ELEMENT student (name, study, hobby)>
<!ELEMENT study (course+)>
<!ELEMENT hobby (#PCDATA)>

<!ELEMENT lecturer (name, teaching, research)>
<!ELEMENT teaching (course+)>
<!ELEMENT course (#PCDATA)>
<!ELEMENT research (#PCDATA)>

<!ELEMENT name (#PCDATA)>
<!ATTLIST name
	title CDATA "1"
	first CDATA #REQUIRED
	last CDATA #REQUIRED
>

<!ATTLIST course
	code CDATA #REQUIRED
>

<!ATTLIST lecturers xmlns:staff CDATA #FIXED "http://ku/staff/ns">
<!ATTLIST students xmlns:stud CDATA #FIXED "http://ku/students/ns">