List all nodes and iterate recursively?

[Cristo-Conklin]

Is there something like $fluid->query('*'), that would list all nodes?
Other ways to iterate all data without knowing the tag beforehand?

[daniele-orlando]

I have not understood what you mean. $fluid->query('//*') returns every node in the document, so it's only a matter of what you want to do with them.

$fluid('//*')->each(function($i, $n) { 
    echo $n->nodeName."\n";
});