The tag "<show>" is hardcoded in the xml parsing code

The readDatabase() function in parser/xml_to_php.parser.php reads an XML file and attempts to generate an array from the contents. This function looks for a tag called "<show>" to split the xml and, while this is a tag that is present in the sample xml file included in the module, I doubt that it is something that you can count on being present in all xml files.

Feeding readDatabase() a file which does not contain a tag will result in it being unable to extract feeditems.