In ODF, they're relative to the package root, in OOXML they always start with a leading slash. Also, in OOXML the stream URI should have its content type as the suffix. Change-Id: Iac570ed15533a23c8a6098f99b716f90e1bac0e0
Stuff for document signing. This code provides dialogs, and infrastructure wrapping libxmlsec that implements document signing.