remove EAN/UPC in favor of GTIN

[VladimirAlexiev]

AgProduct.yml has a prop mapped to https://www.gs1.org/standards/barcodes/ean-upc.

However, that's a web page not a property definition.

• You won't find "EAN" or "UPC" at https://www.gs1.org/voc/
• https://schema.org/gtin13 "equivalent to 13-digit ISBN codes and EAN UCC-13. Former 12-digit UPC codes can be converted into a GTIN-13 code by simply adding a preceding zero"
• https://schema.org/gtin8 "also known as EAN/UCC-8 or 8-digit EAN"

So you see that EAN/UPC is just an old name for gtin.

Note: schema distinguishes between gtin8, gtin13 and their super-property gtin.
gs1: and traceability have only one prop gtin.
IMHO there's no need for two since you can examine the value to see whether it's 8 or 13 digits long.

[OR13]

@nissimsan @BenjaminMoe please comment.

[nissimsan]

@mprorock , @brownoxford , this seems to be one of "yours"?

[BenjaminMoe]

Assigning @rhofvendahl

[paulfdietrich]

This is what I am hearing from our experts at GS1. UPC does not have a GS1 vocabulary since UPC is an industry term and not a GS1 standard like GTIN. When folks say UPC they are often referring to a GTIN-12. The GTIN vocabulary element already included conveys the proper information for agriculture and the UPC field is not required. Care must be taken to ensure that industry users looking for UPC should reference the GTIN field for a GTIN-12. Hope this helps.

[nissimsan]

@rhofvendahl to look into this still.

[OR13]

Not ready for PR, needs refinement. suggest pending close as stale

[OR13]

We think its possibly stale, ping @rhofvendahl

[nissimsan]

@rhofvendahl,
https://w3c-ccg.github.io/traceability-vocab/#PlantSystemsInspectionCredential
has

        "upc": "033383401508",
        "gtin": "033383401508",

[rhofvendahl]

@nissimsan Can't seem to find that. Are you looking at the latest from #863?

Here's the file from that branch

[nissimsan]

@rhofvendahl did this