Additional information on the Grant-ID would be useful

[adam-rehin]

I think it would be helpful to add to the README and also as commentary in the schema some additional information on the source and structure of the Grant-ID.

Some helpful explanation is included in the third paragraph: https://www.crossref.org/blog/wellcome-explains-the-benefits-of-developing-an-open-and-global-grant-identifier/#how-would-it-work.

However, in the XSD (line 547) the pattern for the funder supplied ID is given as:
<xsd:pattern value="10\.[0-9]{4,9}/.{1,200}"/>

It is not clear to me what the numeric portion, 4 to 9 characters long, following the initial 10. corresponds to. Is this intended to be the funder number that follows the http://dx.doi.org/10.13039/ prefix in FunderRegistry (for example 100010269 for Welcome Trust)?

And the last segment: .{1,200} - is this intended to be the funder's UNIQUE grant number (in their own format)?

Also, I note that FunderRegistry has /10.13039/ as the initial segment. Will the GrantId registry have a similar scheme (different number)? That information would also be useful.

[pdfeeney]

It is not clear to me what the numeric portion, 4 to 9 characters long, following the initial 10. corresponds to.

10.[0-9]{4,9} is used to validate the DOI prefix used for funder IDs in the Funder Registry (https://github.com/Crossref/open-funder-registry)

And the last segment: .{1,200} - is this intended to be the funder's UNIQUE grant number (in their own format)?

All funder IDs are DOIs with the 10.13039 prefix and a suffix supplied in the funder registry , I can update the pattern to
<xsd:pattern value="https://doi.org/10\.13039/.{1,200}"/> to reduce confusion.

Also, I note that FunderRegistry has /10.13039/ as the initial segment. Will the GrantId registry have a similar scheme (different number)? That information would also be useful.

Each funder will be issued a distinct DOI prefix when they become a Crossref member, I'll add this to the documentation.

[adam-rehin]

I think your suggested change would be useful.

I'd be inclined to take it further to make the Grant DOI pattern clearer, for example (if my understanding is correct):

<!-- The pattern for the DOI is the FunderID DOI followed by funder supplied unique string -->
<xsd:pattern value="[https://doi.org/10\.13039/[0-9]{1,12}.{1,200}"/> 

Would it also be possible to introduce a new segment which separates the funder supplied grant string from the funder id:

<xsd:pattern value="[https://doi.org/10\.13039/[0-9]{1,12}/.{1,200}"/>