<?XML version="1.0?">
<!DOCTYPE patientinfo [
<!ELEMENT patient (name, sex, age, complaint)>
<!ELEMENT name (#PCDATA)>
<!ELEMENT sex (#PCDATA)>
<!ELEMENT age (#PCDATA)>
<!ELEMENT complaint (#PCDATA)>
<!ELEMENT hr EMPTY>
]>
<PATIENT>
<NAME>John Smith</NAME>
<SEX>Male</SEX>
<AGE>34</AGE>
<COMPLAINT>Frequent headaches and hears voices</COMPLAINT>
</PATIENT>
<HR/>