The <apiclassifier> element is a reference to a classifier.
The <apiclassifier> element can be used to reference a classifier from another DITA topic type.
<task id="httpxml"> <title>Getting an XML file through an HTTP connection</title> <taskbody> <steps> <step><cm>Open the connection.</cm> <info>You use <apiclassifier keyref="java.net.URLConnection">URLConnection</apiclassifier> in a Java application.</info> </step> ... </steps> </taskbody> </task>