<!-- DTD for a simple customer list — samplefiles.com -->
<!ELEMENT customers (customer+)>
<!ATTLIST customers generator CDATA #IMPLIED>
<!ELEMENT customer (first_name, last_name, email, phone?, company?, city, country)>
<!ATTLIST customer
  id ID #REQUIRED
  active (true|false) "true">
<!ELEMENT first_name (#PCDATA)>
<!ELEMENT last_name (#PCDATA)>
<!ELEMENT email (#PCDATA)>
<!ELEMENT phone (#PCDATA)>
<!ELEMENT company (#PCDATA)>
<!ELEMENT city (#PCDATA)>
<!ELEMENT country (#PCDATA)>
<!ENTITY site "samplefiles.com">