concat selected text nodes

Tryng to form an XPath that retuns string from
following XML:

<item>This is a<ver id="0">n old
</ver> <ver id="1">new</ver> sentance.</item>

When $ver='0' return "This is an old sentance."
When $ver='1' return "This is a new sentance.

Play with select="concat(...)" and select="item[...]" and
text() -> no luck. Basically need to concatenat all text
nodes whose parent don't have ver attribute or the version
attribute eqls $ver. Any hlp?

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