Can't upload epub file to Google Play Books

[jkevingutierrez]

Hi,

Awesome book! I'm just trying to upload it to Google Play Books but I cannot upload it. I tried to run this validator: http://validator.idpf.org/application/validate and I got the next Fatal error:
`

Type	File	Line	Position	Message
FATAL	frontmatter.xhtml	44	62	Fatal Error while parsing file 'The reference to entity "asin-com" must end with the ';' delimiter.'.

`

[marijnh]

Ah, I recently broke that it seems—epub uses xhtml, which is way stricter about all kinds of things than html. Attached patch should help.