extract source note field from mets

[davanstrien]

This happens in #15 for mets 18 but we should consider more e.g.:

One question is whether we want to also add this to the other XLSTs? I assume HMD will all use the same version of ALTO but maybe if it's worth adding to the other ALTO XSLT sheet anyway (i.e.
extract_text_mets13.xslt? @GiorgiatolfoBL might have thoughts on this?

[GiorgiatolfoBL]

My opinion: we can (and should) do it for the other METS (18), but BL_newspaper doesn't have the source. Still we could use the namespace to identify this content (question: are all BL_newspapers = JISC?)

[GiorgiatolfoBL]

Update from FMP, for reference:

The material scanned and supplied to us by the BL for this project with have a LWM specific source note. The BL provided the text for the metadata as “British Library Living with Machines Project”. Any material that was scanned as part of the HMD project will have its own source note “British Library Heritage Made Digital Newspapers”. Material scanned by FMP does not have a source note applied.

[davanstrien]

Update from FMP, for reference:

The material scanned and supplied to us by the BL for this project with have a LWM specific source note. The BL provided the text for the metadata as “British Library Living with Machines Project”. Any material that was scanned as part of the HMD project will have its own source note “British Library Heritage Made Digital Newspapers”. Material scanned by FMP does not have a source note applied.

Thanks for checking this. I think having the source note for HMD + LWM will be super helpful even if it is not available for the other papers.