Extract source citation to template
Extract source citation to template

Source citation happens in element dc:source, according to XMetaDissPlus
specification 2.2. However, WinIBW PICA script assumes the information
in dcterms:isPartOf.

Resolves https://jira.slub-dresden.de/browse/CMR-543

qucosa/qucosa-fcrepo-xmetadissplus