In addition to registering namespace (the answer from stackoverflow ) you can also match using 

/TradenetResponse/OutboundMessage/
*[ name ="OutwardPermit" ]/*[ name = "Declaration" ]...

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However powerful xml/xpath are, they are just as dumb, maybe even twice that

In reply to Re: Using PERL to extract XPATH with ":" character by Anonymous Monk
in thread Using PERL to extract XPATH with ":" character by veritas_penang

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