The Compare(xmlTree1, xmlTree2) command returns a sub-operand l such that $\mathrm{op}\left(l\,\mathrm{xmlTree1}\right)\ne \mathrm{op}\left(l\,\mathrm{xmlTree2}\right)$.

The arguments must be correctly formed XML tree data structures.

$\mathrm{with}\left(\mathrm{XMLTools}\right)\:$

$\mathrm{xmlTree1}≔\mathrm{ParseString}\left(''''\right)\:$

$\mathrm{xmlTree2}≔\mathrm{ParseString}\left(''''\right)\:$

$l≔\mathrm{Compare}\left(\mathrm{xmlTree1}\,\mathrm{xmlTree2}\right)$

$l≔\left[1\,3\,1\,3\,1\,2\,1\,2\,1\right]$

$\mathrm{op}\left(l\,\mathrm{xmlTree1}\right),\mathrm{op}\left(l\,\mathrm{xmlTree2}\right)$

$''u'',''v''$

$\mathrm{op}\left(l\left[1..-2\right]\,\mathrm{xmlTree1}\right),\mathrm{op}\left(l\left[1..-2\right]\,\mathrm{xmlTree2}\right)$

$\mathrm{\_XML\_AttrValue}\left(''u''\right),\mathrm{\_XML\_AttrValue}\left(''v''\right)$