In the following example, the first parameter of %XML is a character
variable containing an XML document. Since the doc option
defaults to "string", no options are necessary. However, option doc=string may
be specified, as in the second XML-INTO statement below.
xmldata = '<data><num>3</num></data>';
XML-INTO data %XML(xmldata);
XML-INTO data %XML(xmldata : 'doc=string');