[XSLT] select strings in reverse two by two

[jag]

Hi ppl,

I have a xml document with:
<georss:line> latitude longitude latitude longitude </georss:line> and i want the same but in reverse order, two by two, latitude and longitude switched:
<line>longitude, latitude, longitude, latitude </line>

<xsl:for-each select="tokenize(normalize-space(georss:line),' '))">
<xsl:value-of select="."/>,
</xsl:for-each>

My inicial thought was two create two params, pair and latitude and save the latitude and test when it was pair. XSLT give me errors that i couldn't xslaram must be immediately within a template, function or stylesheet

then i found out that there was for-each-group and tried to group two by two but i don't know how.

How can i do it?

Thanks,
jag