An error occurred while parsing the XML document. Error number : 516

Error Message

Schema Wizard returns an error when importing a XMI file:

"An error occurred while parsing the XML document. Error number : 516"

Cause

The uml.dtd file does not exist in the same directory as the XMI file.

Solution or Workaround

1. Copy the uml.dtd file from the appropriate location. For ArcGIS 8.x, the default location would be C:\ArcGIS\arcexe83\CaseTools\Utilities. For ArcGIS 9.0, the default location would be C:\Program Files\ArcGIS\CaseTools\Utilities.
2. Paste the uml.dtd file in the same folder as the XMI file being used.