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https://issues.apache.org/jira/browse/CSV-293?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17452451#comment-17452451
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Gary D. Gregory commented on CSV-293:
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Hi [~paulmillar]
Feel free to provide a PR on GitHub ;-)
> 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
> Affects Versions: 1.9.0
> 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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