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https://issues.apache.org/jira/browse/CSV-293?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17873527#comment-17873527
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Bernd Eckenfels commented on CSV-293:
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I don’t think we need to target full CSVW support if users are fine with
reading CSV files and do the multi table and validation stuff themself. However
the parser should support common escaping and data constructs (like the null
value). If the change only extends an existing feature to be consistent across
multiple columns, Indont see a reason why not.
Or let me ask this way is there a drawback of this change, wha does the current
version only allow one nullable column?
> Add support for multiple null String values
> -------------------------------------------
>
> Key: CSV-293
> URL: https://issues.apache.org/jira/browse/CSV-293
> Project: Commons CSV
> Issue Type: Improvement
> Components: Parser
> Reporter: Paul Millar
> Priority: Minor
>
> The [CSVW namespace|https://www.w3.org/ns/csvw] provides metadata describing
> a CSV file. One element of this is the ability to associate certain certain
> values with the {{null}} value, as recorded by the [csvw:null
> property|https://www.w3.org/ns/csvw#property-definitions].
> This definition corresponds (broadly) to the "null String" concept (see
> [org.apache.commons.csv.CSVFormat#setNullString|http://commons.apache.org/proper/commons-csv/apidocs/org/apache/commons/csv/CSVFormat.Builder.html#setNullString-java.lang.String-]),
> with one noticeable difference: {{CSVFormat}} supports only a single "null
> String" value while CSVW, through {{csvw:null}}, supports multiple Strings.
> In order to fully support CSVW, it would be helpful if {{CSVFormat}} were to
> be updated to allow multiple null String values.
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