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PROPOSED.md

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Proposed modifications for HED schema

This is a record of proposed changes/corrections to the HED schema for future release. As suggestions reach consensus they will be moved to this document.

Proposed changes/corrections (requiring more development/discussion)

Add Body between Anatomical-item and Body-part

Then we can annotate right hand as (Hand, (Right-side-of, Body)). Should the recommended way to annotate right hand be: (Hand, (Right-side-of, Body)) (Hand, (Right-side-of, Human-agent)) (Hand, (Right-side-of, (Human-agent, Torso)))

Add value class --- not sure what class this should be needs discussion (See issue #324)

  • Item/Object/Man-made-object/Device/IO-device/Input-device/Keyboard/Keyboard-key/#
  • Item/Object/Man-made-object/Device/IO-device/Input-device/Keypad/Keypad-key/#
  • Property/Informational-property/Metadata/Pathname/#
  • Property/Informational-property/Metadata/CogAtlas/# (What are these?)

Placeholders clearly missing value class or other specification.

Add numericClass attribute (* indicates should consider unit class too)
  • Property/Agent-property/Agent-trait/Age/#
  • Property/Data-property/Data-resolution/Printer-resolution/#
  • Property/Data-property/Data-value/Spatiotemporal-value/Rate-of-change/Sampling-rate/#
  • Property/Data-property/Data-value/Spatiotemporal-value/Rate-of-change/Refresh-rate/#
  • Property/Data-property/Data-value/Spatiotemporal-value/Spatial-value/Angle/#

Review of attributes

  • takesValue appears to now be redundant, as it is only used with #, which is assumed to take a value.
  • Do we need a topLevel attribute?
  • Proposed (@MichaelJachan) add schema attribute conversionFactor which takes a value (i.e. does not have boolProperty). This attribute is associated with unit classes that are not SIUnits and gives the multiplicative conversion factor between the specified units and the default units. (Suggest adding to version 8.1. @VisLab).

Review of unitClasses and Units

  • Add euro as a currency unit
  • Add WeightUnits and reorganize VolumeUnits
  • Deal with grams

Agreed upon changes/corrections

  • Action/Perceive should be Action/Sensory-attend.
  • Action/Perceive/See should be Action/Sensory-attend/Look.
  • Action/Perceive/Hear should be Action/Sensory-attend/Listen.
  • Add tag Data-property/Data-marker/Data-break-marker.

Typos/corrections

This section lists typos or other errors that should be fixed.

  • Correct the word between in **** Fraction <nowiki>[A numerical value betwee 0 and 1.]</nowiki>
  • Rename labelClass to nameClass in `Property/Informational-property/Parameter/Parameter-label/#'
  • Rename labelClass to nameClass in `Property/Sensory-property/Sensory-attribute/auditory-attribute/Timbre/#'
  • The description of topLevelTagGroup schema attribute to mention that only one tag with the topLevelTagGroup attribute can appear in the same tag group.

Suggested additions

This section suggests listed additions to the HED tags

  • Add Distracted to Agent-emotional-state. (Source Monique Denissen. Re: Often experiments are designed with distractions and surveys may assess the participant's degree of distration.)
  • Add Arrow to 2D-shape. (Source Monique Denissen. Re: Arrow is a common 2D-shape used in experiments.
  • Needed some way of tagging that the participant is finished --- like an OK or Done. (Source Monique Denissen)
  • Add Sound-volume/# to allow specification of a numerical value. Loudness can be grouped with qualitative attributes such as High (Source Scott Makeig).
  • Consider adding other times of numerical features such as Absmax, First-derivative-max (Source Scott Makeig).

Topics for future discussion

This section describes topics for future discussion:

  • Alternative syntax for library tags.
  • Spatial specification tags. Should these be in a spatial library?
  • Formulation of task and event linkage.