Re: sorting based on a variable

hi (another question)

lets say I want to some data for the $column data-column

<projects>
  <project name="a">
    <data> 1237</data>
    <data> 1234</data>
    <data> 1235</data>
    <data> 1236</data>
  </project>
  <project name="b">
    <data> 12</data>
    <data> 41234</data>
    <data> 51235</data>
    <data> 71236</data>
  </project>
  <project name="c">
    <data> 1</data>
    <data> 41234</data>
    <data> 51235</data>
    <data> 71236</data>
  </project>
</projects>

so if $column=1 then it would sort them into {project name="c", project
name="b", project name="a"}
however i've tried
<xsl:for-each select="projects/project">
    <xsl:sort select="./data[$column]" data-type="number"/>
but it doesn't work?
however if just use something like
    <xsl:sort select="./data[1]" data-type="number"/> it works fine

anyone can tell me what im doing wrong?

regards
  Kasper Nielsen