Selecting descendent text node

I want to select the last (or first) text node descendant of a particular
element (lets say, list):
To select the first text node:
xpath=(list//text())[1]
To select the last text node:
xpath=(list//text())[last()]

However, XSLT does not allow this kind of matching in a template match:
Is there a way around this?
M@
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