-S dtxxmlconv option
The source document file name or URL (-S) option of the dtxxmlconv utility command will have a parameter to specify the source document used to generate the original schema. This will either be a .dtd (DTD) or .xsd (schema) file and will represent the new XML grammar that will be used to generate the schema.
If there is no value specified, the utility will automatically use the value that is specified in the schema. If a value is specified, the utility will use that specified value instead of the one from the schema.