XML : for each xslt looks at first item only

I have XML that looks like

  <data>  <groups name="Group1"/>  <groups name="Group2"/>  <groups name="Group3"/>  </data>    

when using

  <xsl:for-each select="/data/groups/@name"><value-of select="/data/groups/@name"/></for-each>    

I get Group1Group1Group1 not Group1Group2Group3.

Why is for each only looking at the first item and not all three items.

Please provide answers in pure javascript or xslt.