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https://issues.apache.org/jira/browse/TIKA-1027?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13500313#comment-13500313
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Ray Gauss II commented on TIKA-1027:
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We'll want to define suggested behavior for embedding since a {{Metadata}}
object is passed to an embedder containing the values to be set, and in some
cases users will want to set certain fields to {{null}}.
An empty String could be used to indicate that a particular field should be set
to {{null}} by the embedder, but if we move to something other than Strings to
hold values in the {{Metadata}} class we'll need to re-evaluate.
> Allow null values when setting metadata
> ---------------------------------------
>
> Key: TIKA-1027
> URL: https://issues.apache.org/jira/browse/TIKA-1027
> Project: Tika
> Issue Type: Improvement
> Components: metadata
> Reporter: Jukka Zitting
> Assignee: Jukka Zitting
> Priority: Minor
> Fix For: 1.3
>
>
> Many file formats have optional metadata entries that result in a lot of {{if
> (value == null)}} statements around {{metadata.set(...)}} calls. It would be
> more convenient if the {{set}} method explicitly allowed a {{null}} value and
> that a call like {{metadata.set(name, null)}} was essentially equivalent to a
> {{metadata.remove(name)}} call.
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