This is a Progress SQL-89 specific option which if set the driver returns " " rather than "" to represent this database does not have a quoted identifier character. The ODBC specification says that " " is what should be returned but some applications (like Crystal Reports) interpret this response as meaning the quoted identifier character is a "space", which obviously does not make sense and fails, as they are expecting "" to be returned hence this need for this option.
This document is empty and basically useless. It is generated by a web service that can make some statements in HTML Microdata format. This time the service made zero such statements, sorry.