Here is an example of a NCBI Pubmed (http://www.ncbi.nlm.nih.gov , a
publication database widely used by life sciences scientists) generated feed.
It does not validate under feedvalidator. The output is below.
The feed url:
This feed does not validate.
line 27, column 80: author must include an email address: Kim NH, Lee JA, Eun
BW, Shin SH, Chung EH, Park KW, Choi EH, Lee HJ (2 occurrences) [help]
<author> Kim NH, Lee JA, Eun BW, Shin SH, Chung EH, Park KW, Choi EH,
In addition, this feed has issues that may cause problems for some users. We
recommend fixing these issues.
Your feed appears to be encoded as "UTF-8", but your server is
reporting "US-ASCII" [help]
line 13, column 53: Image link doesn't match channel link [help]