Add formal references

[nichtich]

What Data Package version are you using?

v2

Describe the Issue

Specifications should have a section called "Normative References" referencing standards they build on. For Data Package this would be:

• S. Bradner: Key words for use in RFCs to Indicate Requirement Levels. RFC 2119, March 1997. https://tools.ietf.org/html/rfc2119
• T. Bray: The JavaScript Object Notation (JSON) Data Interchange Format. RFC 7159, March 2014. https://tools.ietf.org/html/rfc7159
• J. MacFarlane : CommonMark Spec. Version 0.31.2, January 2024. https://spec.commonmark.org/0.31.2/
• Open Knowledge Foundation: Open Definition Licenses. https://opendefinition.org/licenses/

In addition URL and POSIX Path need references. For the latter https://pubs.opengroup.org/onlinepubs/9799919799/ seems the right document but this is pretty heavy, so we may better add our own definition of "POSIX path" and reference POSIX an non-normative. A POSX file name can contain any byte, except slash or NULL.

Participation

• I am willing to submit a pull request for this issue.