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The IsComment(expr) command tests whether a Maple expression expr is an XML comment data structure. If expr is an XML comment data structure, the value true is returned. Otherwise, false is returned.

Such expressions can be encountered in XML documents that are read from external sources, or can be generated programmatically by using the XMLTools[XMLComment] constructor.

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

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

$\mathrm{false}$

$\mathrm{IsComment}\left(\mathrm{XMLComment}\left(''Some\; comment\; text''\right)\right)$

$\mathrm{true}$