eZRSSExport should replace the use of named entity references with their numerical equivalents. For example: use &#160 or   instead of  

I see this as a problem that can easily be fixed in the export. Having it like it is now will just generate more support questions because   and similar will occur in content.

See http://www.feedvalidator.org/docs/error/UndefinedNamedEntity.html and http://www.w3.org/TR/xhtml1/dtds.html#a_dtd_Latin-1_characters

Steps to reproduce

Export a TextBlock that contains   through eZRSSExport