2021-release-01

Changes in this release:

• Improved documentation (HTML or PDF)
  • Guidence on marking up gaps
• New values for status attributes in availability elements:
  • "printcat" for items orderable through a catalogue of printed materials
  • "none" for items that cannot be ordered
• New Schematron rules for checking date and numerical ranges

Built on latest TEI P5 version, 4.2.2, so changes since the 4.0.0 release are incorporated, see:

https://www.tei-c.org/release/doc/tei-p5-doc/readme-4.1.0.html
https://www.tei-c.org/release/doc/tei-p5-doc/readme-4.2.0.html
https://www.tei-c.org/release/doc/tei-p5-doc/readme-4.2.1.html
https://www.tei-c.org/release/doc/tei-p5-doc/readme-4.2.2.html

Notably, q elements can be used in some contexts that were invalid previously.