[ipac] HIP 3.0 ISSN in XML? Inconsistent presentation.

[Jonathan Rochkind]

I am doing some XSLT "hacking" in HIP 3.0, in which I need access to the 
ISSN.

Normally, if a bib has an ISSN, it is put in the HIP 3.0 XML, in an 
<issn> tab. For instance, see this record:
http://catalog.library.jhu.edu/ipac20/ipac.jsp?&profile=general&uri=link=3100007~!3033672~!3100001~!3100002&GetXML

[I think I've succeeded in giving you a persistent URL].

Search that content for the tag <issn>, and you'll find it, with an ISSN 
in it.

However, in some cases, the bib seems to have an ISSN, but no ISSN tag 
is included. The ISSN is reported on the html full bib, and it is 
included in the XML just as a <cell>. But it would be much easier to get 
it from an <issn> tag, where it _usually_ is.  But in some cases isn't. 
For instance:

http://catalog.library.jhu.edu/ipac20/ipac.jsp?profile=general&uri=link=3100007~!5523158~!3100001~!3100002&GetXML


Does anyone have any idea what's going on? Why my ISSN sometimes shows 
up in the XML as an <issn> tag, and sometimes not?

Thanks for any advice,
Jonathan