The PNG Metadata Format Specification in the package description for javax.imageio.metadata has the text "The semantics of the standard chunks are described in the PNG specification" which includes a hyperlink to http://www.freesoftware.com/pub/png/spec/ Unfortunately that domainname doesn't seem to be valid any more and it takes you to a site full of commercials. We should instead link to http://www.libpng.org/pub/png/spec/ as is done in the table in the package description for javax.imageio
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