In jQuery I'm trying to select only mount nodes where a and b's text values are 64 and "test" accordingly. I'd also like to fallback to 32 if no 64 and "test" exist. What I'm seeing with the code below though, is that the 32 mount is being returned instead of the 64.

The XML:

<thingses>
    <thing>
        <a>32</a> <-- note, a here is 32 and not 64 -->
        <other>...</other>
        <mount>sample 1</mount>
        <b>test</b>
    </thing>
    <thing>
        <a>64</a>
        <other>...</other>
        <mount>sample 2</mount>
        <b>test</b>
    </thing>
    <thing>
        <a>64</a>
        <other>...</other>
        <mount>sample 3</mount>
        <b>unrelated</b>
    </thing>
    <thing>
        <a>128</a>
        <other>...</other>
        <mount>sample 4</mount>
        <b>unrelated</b>
    </thing>
</thingses>

And unfortunately I don't have control over the XML as it comes from somewhere else.

What I'm doing now is:

var ret_val = '';

$data.find('thingses thing').each(function(i, node) {
    var $node = $(node), found_node = $node.find('b:first:is(test), a:first:is(64)').end().find('mount:first').text();
    if(found_node) {
        ret_val = found_node;
        return;
    }

    found_node = $node.find('b:first:is(test), a:first:is(32)').end().find('mount:first').text();
    if(found_node) {
        ret_val = found_node;
        return;
    }

    ret_val = 'not found';
});

// expected result is "sample 2", but if sample 2's parent "thing" was missing, the result would be "sample 1"
alert(ret_val);

For my ":is" selector I'm using:

    if(jQuery){
        jQuery.expr[":"].is = function(obj, index, meta, stack){
            return (obj.textContent || obj.innerText || $(obj).text() || "").toLowerCase() == meta[3].toLowerCase();
        };
    }

There has to be a better way than how I'm doing it. I wish I could replace the "," with "AND" or something. :)

Any help would be much appreciated. thanks!