XPATH query from variable

Hi,

<xsl:value-of select="$clickThroughImages/../../position()"/>

if $clickThroughImages is essentially an alias for
/mediaobjectset/mediaobject/imageset/image why doesn't
$clickThroughImages/../../position() return the position of
'mediaobject' within 'mediaobjectset' when an expression such as
$clickThroughImages/../../@ordinal correctly de-references the ordinal
attribute of 'mediaobject'?

Many Thanks

Gary

PS the value of is running in a for-each loop of $clickThroughImages

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