Use an XBRL taxonomy to specify the data for collection
Re-use taxonomy modules from other standards setters
Use additional metadata to make the taxonomy more useful for analysis such as the reference linkbase for capturing thematic, cross-cutting metadata
Avoid modifying a published taxonomy
If you are permitting filer extension taxonomies, then think about how to control and restrict their scope
Consider using a public, central registry for extension concepts
Support more than one taxonomy version for filers to file against for a long period
Perhaps indicate the preferred taxonomy version for reporting while also indicating others are acceptable for entities fitting certain criteria (such as those having to report in multiple jurisdictions)
Data collection format (inline XBRL)
Where reporting is open and/or contains narrative (text blocks), use Inline XBRL to collect sustainability data
Republish collected data as a public good
Republish it exactly as originally filed
Also make available XBRL-JSON version of it for easy use with analysis tools
Make sure filers use only units defined in the XBRL Unit Type Registry
Get in touch with us if you think you might need additional units defined in the registry
Narrative data
Ensure narrative data tagging is organised so as to maximise the machine readability of the data
The standard setter should decide on a reasonable level of detail of nested narrative tags. Nested narrative tags should only be required if tagging of corresponding texts brings additional benefit to the consumers of the data, compared to the “parent” narrative tag, that contains the same text as well.
Design the taxonomy so that narrative questions make use of extensible enumerations where appropriate
Public repository of sustainability reports
A public repository of the submitted data should be made available by the regulator (or other entity) collecting reports
Interested parties know there is a source of sustainability report that is authoritative and trustworthy
It is easy to find a given entities sustainability report or be confident that no such report exists