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[ENH] Add a Consistency principle to Common principles #1530

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16 changes: 16 additions & 0 deletions src/common-principles.md
Original file line number Diff line number Diff line change
Expand Up @@ -28,6 +28,22 @@ A guide for using macros can be found at
-->
{{ MACROS___define_common_principles() }}

## Consistency principle

To effectively implement the underpinning motivation of this data structure,
it is fundamental that all the specifications and extensions of BIDS
are based on a principle of consistency, stated as follows:
> Given the same original dataset generated by a neuroimaging acquisition device,
two different researchers who possess thorough knowledge of BIDS (and of the original
source's formats) should independently generate a "virtually" identical BIDS structure
when tasked with the conversion of the data into BIDS.

Here, "virtually" highlights the fact that some aspects of this specification are OPTIONAL,
and therefore can be freely chosen by the BIDS encoder.
For example, the "participant" labels chosen by one researcher could be
a zero padded index based at one, and the other could choose hexadecimal encoding,
while the dataset would remain "virtually" identical.

## Entities

An "entity" is an attribute that can be associated with a file, contributing
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