XML Name Conversion Considerations

When a source name is encountered that does not fit within XML naming conventions, default generated names are converted according to rules described by the SQLX standard.

Generally speaking, an invalid XML name character is replaced by its hexadecimal escape sequence (having the form xUUUU).

For additional details see section 9.1 of the W3C draft version of this standard:
http://www.sqlx.org/SQL-XML-documents/5WD-14-XML-2003-12.pdf