Hi,
I would like to bring to your attention a new module I made, for handling datatypes, see
http://kuberam.ro/specs/expath/datatypes/datatypes.html.
The module is available at
http://exist-db.org/exist/apps/public-repo/packages/expath-datatypes-exist-lib.html?eXist-db-min-version=2.3.0.
For now, it converts only from xs:base64Binary input data to xs:byte* but, if it is of interest and I will have time, I can add more conversions.
This module is currently used for accessing AWS S3 and Azure, as was mentioned in the discussion at
http://exist.2174344.n4.nabble.com/hmac-signature-for-AWS-S3-td4670354.html.
Claudius