A simple DTD example

<!ENTITY % streetADR "streetNumber, streetName">

<!ELEMENT address (companyName, %streetADR;,

cityName, postalCode,

countryCode, companyURL)>

<!ELEMENT companyName (#PCDATA )>

<!ELEMENT streetNumber (#PCDATA )>

<!ELEMENT streetName (#PCDATA )>

<!ELEMENT cityName (#PCDATA )>

<!ELEMENT postalCode (#PCDATA )>

<!ELEMENT countryCode (#PCDATA )>

<!ELEMENT companyURL (#PCDATA )>

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