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CHANGELOG for HED specification

Changes for HED specification 3.2.0

  • The Inset tag was introduced to mark intermediate points in events of temporal extent.
  • Partnered schemas were introduced using the withStandard schema header attribute and the rooted schema attribute.
  • The curly brace annotation for sidecars was introduced.

Changes for HED specification 3.1.1

This release is added additional minor corrections and clarifications in the specification document and does not include any enhancements from version 3.0.0.

Changes for HED specification 3.1.0

This release is focused on corrections and clarifications in the specification document and does not include any enhancements.

  • [Clarification] The inner tag group in a definition cannot be empty.
  • [Clarification] The additional tags within an Onset or Offset group must be enclosed in parentheses. Consequently, only one definition can anchor an event of temporal extent.
  • [Correction/Clarification] The initial specification said that definitions could be given anywhere. Our examples only put them in dummy entries in the sidecars. Allowing definitions to be anywhere turned out to be burdensome for downstream analysis tools. We have now restricted definitions so that they can only appear in dummy entries of sidecars.
  • [Clarification] Chapter 3.2 was rewritten so that full specification details of tag syntax were given and keyed to error codes in Appendix B.
  • [Clarification] Error codes of Appendix B were modified to have more consistent form, and some additional codes were added to account for requirements of the specification.
  • [Improvement] Each error code in Appendix B was given its own markdown section so that error messages in the validators could use the error code as a link into the specification for more information about the cause of errors.
  • [Improvement] A standardized set of validation test data keyed to the error codes was added to the specification repository in the tests directory. This test data will be validated by both the Python and JavaScript validators in addition to their internal tests as part of the GitHub actions.
  • [Clarification] All chapters of the specification were edited for clarity and correctness.

Initial release 3.0.0 Oct. 27, 2022.

The specification version was set to 3.0.0 to designate the specification for HED-3G corresponding to HED standard schema versions >= 8.0.0