XUpdate

[Mark J. Stang]

Hi,
I have been working with XUpdate and have a question.
If I use a select, such as

        "//account/customer/name/first[text()='Mark']"

for an XUpdate, aren't I telling it to change every first name that is
'Mark'
to the new value.   How do I specify a particular document, rather than
all?
This seems to be a "global change".   I could embed the key in the
document
but then I have to have a "select" AND "select".   Is there someway to
specify
a key to a document and its' path?

thanks,

Mark