THDL Toolbox > Places & Geography > THDL Gazetteer > Gazetteer DTD Decoded For Dummies > extref Element
<!ELEMENT extref (#PCDATA|extptr|%m.inline;)*> <!ATTLIST extref %a.common; entityref ENTITY #IMPLIED href CDATA #IMPLIED lang %LANGUAGE; #IMPLIED xpointer CDATA #IMPLIED>
extref = A linking element which connects the gazetteer to an external (most often text) electronic object, such as another XML or HTML document. Unlike the extptr element, the extref element may contain text or other elements that identify or describe the referenced object. Extptr sub-elements may be used to include external digital objects which identify or describe the referenced object, such as an icon or a thumbnail image. It is a semantic error not to have either an entityref or href attribute.