The IsElement(expr) command tests whether a Maple expression expr is an XML tree data structure that represents an XML element. This is an XML tree that is not a CDATA structure, comment or processing instruction. If expr is an XML element, the value true is returned.  Otherwise, false is returned.

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

$\mathrm{IsElement}\left(\mathrm{XMLElement}\left(''a''\,\left[''b''=''c''\right]\,''d''\,''e''\right)\right)$

$\mathrm{true}$