<?xml version="1.0"?>
<!DOCTYPE example PUBLIC "" "example.dtd" [
<!ENTITY wwwmurrayc "http://www.murrayc.com">
<!ENTITY wwwlibxmlplusplus "https://libxmlplusplus.github.io/libxmlplusplus">
<!ENTITY mercury "&#x263f;">
<!ENTITY venus "&#x2640;">
<!ENTITY earth "&#x2641;">
<!ENTITY mars "&#x2642;">
<!ENTITY planets "&mercury;(&#x263f;), &venus;(&#x2640;), &earth;(&#x2641;), &mars;(&#x2642;)">
]>

<example>
  <examplechild id="1">
    Some content. &wwwmurrayc;
    Some other content &wwwlibxmlplusplus;
    <child_of_child/>
    Mercury &mercury;
    Some planets &planets;
  </examplechild>
</example>

