The <cxxdefine> element is a reference to a C++ define.
The <cxxdefine> element can be used to reference a C++ define from another topic type.
<task id="connectionsxml"> <title>Connections</title> <taskbody> <steps> <step><cm>Open the connection</cm> <info>You can use <cxxdefine keyref="definekey">CONNECTED define</cxxdefine> in a C++ application.</info> </step> ... </steps> </taskbody> </task>