XSLT Transform doesn't work until I remove root node

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I\'m trying to extract the headline from the below XML from the Met Office web service using XSLT, however my XSLT select returns blank.

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                  耶瑟儿～        
                
              
                            
                2020-11-21 07:21
              
            
            
                                                                       
The problem: your XML puts its elements in a namespace.   

Solution: declare the same namespace in your stylesheet, assign it a prefix and use that prefix to address the elements in the source XML:

XSLT 1.0

<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:met="www.metoffice.gov.uk/xml/metoRegionalFcst"
exclude-result-prefixes="met">
<xsl:template match="/">
  <html>
  <body>
   <xsl:value-of select="met:RegionalFcst/met:FcstPeriods/met:Period/met:Paragraph[@title='Headline:']"/>
  </body>
  </html>
</xsl:template>
</xsl:stylesheet>

                                                                        
                                                        
            
            
              
                
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