Hi,
parsing http://schema.org/Person with rapper, I stumbled upon the following problem and I guess it is caused by librdfa: The page containes named character references (see HTML5 spec) such as   and because HTML5 does not come with a DTD, the ones exceeding the default XML escapes are considered undefined thus stopping the parsing with an error:
rapper: Error -  - XML parser error: Entity 'nbsp' not defined
Yet, those escapes are allowed in HTML5 and around and it would therefore be great if librdfa could support them.
Cheers,
Tobias