dumpcheck is a C program that will scan the UTF-8 encoded XML data dump files exported by ODP and report the location of invalid UTF-8 sequences, illegal XML characters, illegal Unicode characters, and XML well-formedness errors. This helps ODP staff to find and correct problems in the data dump generation scripts. The line number, byte offset, approximate ODP category ID, and hex values of offending XML and UTF-8 characters are reported. The line number of XML well-formedness errors is reported (thanks to libxml2!). While this program is intended to assist with debugging of the ODP data dumps it may be useful for other tasks as well.