Remove elements based on other element's value — XSLT

Question

I have a style-sheet that I am using to remove certain elements based on the value of an other element. However, it is not working ...

Sample Input XML

Answer 1

Here is a complete XSLT transformation -- short and simple (no variables, no xsl:if, xsl:choose, xsl:when, xsl:otherwise):

When this transformation is applied on the provided XML document:

    1999
    ABC
    Testing
    Ok

the wanted, correct result is produced:

   1999
   ABC