The following Common Services files shall be present in a Descriptor:

• “[Content_Types].xml” file is located in the top-level folder “/”;

NOTE The brackets [ ] are literal text for the .xml file name as defined by the Open Packaging Conventions container.

• relationship file “.rels” is located in the folder “/_rels”;
• the “origin.psdor” file is located in the folder “/package/service/digital-signature”;
• the relationship file “origin.psdor.rels”, which lists the digital signatures, is located in the folder “/package/service/digital-signature/_rels”;
• at least one digital signature file with the file name extension .psdsxs is located in the folder “/package/service/digital-signature/xml-signature”.