Before I forget:

Lizzy you wrote this :

"In the creator set you ask us to change the creator name from “Bruna, Dick” to “Dick Bruna”

Before spending hours on writing XSLT: has anyone else written XSLT code to transform a creators’name and could we “borrow” your XSLT code?

That would save us sooooo much time""

At the Rijksmuseum you have indexed most or all of your creators to the RKDartists database and we have matched a good chunk of those on Mix-n-Match. If you export your RKD matches you can use our downloadable Mix-n-Match set of names to make the conversion.

Here is the link to download the text file with matched RKDartist names (Q numbers without the leading "Q")

https://tools.wmflabs.org/mix-n-match/api.php?query=download&catalog=38