You can use more than one profiling attribute in a document, and even on the same element. For example:

<para  os="win"  userlevel="beginner">
...
</para>

Both conditions must be matched at processing time for the element to be included.

Whichever profiling attributes are used in your documents must be accounted for when you process the documents. If you are using three different profiling attributes, you will need to set three conditions at processing time.

You can assign more than one key word to a profiling attribute by separating them with semicolons. For example, if you profile on os with the key words linux, unix, or win, then an element that applies to both linux and unix should have the attribute os="linux;unix". Then it will be selected if either of linux or unix is specified at processing time.

If you need AND logic on a profile parameter, you can use two profiling passes. For example, normally an element with os="linux;unix is selected if either linux OR unix is specified at runtime. If you need this to mean linux AND unix, and exclude the single values os="linux" and os="unix", then perform two profiling passes. In the first pass, set profile.os="linux" to exclude os="unix", and in the second pass select profile.os="unix" to exclude os="linux". Only those with os="linux;unix" will survive.

Take special care if you need to nest conditionalized elements. A condition applies to an element and all of its content. If the container element is not selected during processing, then the interior elements are never even considered.