database-url is mandatory but has no alternative for "no database" case

HUPO-PSI / mzTab

mzTab Reporting MS-based Proteomics and Metabolomics Results

https://hupo-psi.github.io/mzTab

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Closed nilshoffmann closed 5 years ago

nilshoffmann commented 6 years ago

The Database URL should either be made Mandatory = false, or it should be reported as "null" just as in the case of prefix. ` Description:	The URL to the database.
Type:	URL
Mandatory	True
Example:	database[1]-url http://www.hmdb.ca/

nilshoffmann commented 6 years ago

I will go with the Mandatory: True but value has to be reported as "null" if database-name is "no database" to get forward with the validator.

andrewrobertjones commented 6 years ago

@nilshoffmann is going to make the minor change in the spec doc to say that null is okay for no database case