//SOME_TAG[. !=''] ignores just the first two cases, but selects the third
   one containing the white-space  .


either list SOME_TAG in the  strip-space elements list, in which case
white space nodes appearing as children of SOME_TAG won't appear in the
input tree, so your current test will work, or use

//SOME_TAG[normalize-space(.) != '']

David







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