class="attribute">arch</sgmltag>. We can store identifier of operating
system, user group or hardware architecture here. You can also store
profiling information into some general use attribute like <sgmltag
-class="attribute">role</sgmltag>. <xref
-linkend="ex:doc"/> shows how document with profiling information might
+class="attribute">role</sgmltag>. <xref linkend="ex.doc"/>
+shows how document with profiling information might
look like.</para>
<example id="ex.doc">