Since MODS is a subset of MARC, some data may be lost and other put
into a less specific field than it came from. In this case the 856$d, $f
and $g are used by the Library of Congress internally; they all become
part of the URI recorded in $u. So, they are not needed in distributed
records; only the $u is. The only 856 element that is needed is $3 which
is currently not in MODS, but we are adding it in the next version (soon
to be completed).

Rebecca

On Thu, 5 Dec 2002, Yves Pratter wrote:

> Curently, i found a problem with the MARC21 to MODS conversion :
> I "play" with the OAI server of the american memory.
>
> With a movie about the Roosevelt Dam near Phoenix, the digital video is in 3
> parts.
> All theses parts are discribed in the MARCXML record (field tag 856,
> subfields $f), but they are loosed in the MODS record.
> MARCXML RECORD :
> http://memory.loc.gov/cgi-bin/oai2_0?verb=GetRecord&metadataPrefix=marc21&id
> entifier=oai:lcoa1.loc.gov:loc.mbrsmi/trmp.4095
>
> <datafield tag="856" ind1="7" ind2="">
>     <subfield code="d">trmp</subfield>
>     <subfield code="f">4095s1</subfield>
>     <subfield code="f">4095s2</subfield>
>     <subfield code="f">4095s3</subfield>
>     <subfield code="g">urn:hdl:loc.mbrsmi/trmp.4095</subfield>
>     <subfield code="u">http://hdl.loc.gov/loc.mbrsmi/trmp.4095</subfield>
>     <subfield code="q">m</subfield>
>     <subfield code="2">http</subfield>
> </datafield>
>
> MODS RECORD :
> http://memory.loc.gov/cgi-bin/oai2_0?verb=GetRecord&metadataPrefix=mods&iden
> tifier=oai:lcoa1.loc.gov:loc.mbrsmi/trmp.4095
>
> <identifier type="uri">http://hdl.loc.gov/loc.mbrsmi/trmp.4095</identifier>
>