Journal ISSN
Capture both print and electronic ISSN in the journal metadata if available.
All articles must have an electronic ISSN in the journal metadata.
Always capture print ISSNs when available. Online-only journals will have electronic ISSNs only.
All ISSN values
must be valid (of the form nnnn-nnnx where x is a checksum
digit), and require the pub-type attribute. Valid values for
pub-type are ppub
and epub
.
Print ISSN
/article/front/journal-meta/issn[@pub-type="ppub"]
Online ISSN (ESSN)
/article/front/journal-meta/issn[@pub-type="epub"]