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https://issues.apache.org/jira/browse/TIKA-1607?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14505054#comment-14505054
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Ray Gauss II commented on TIKA-1607:
------------------------------------
We've had a few discussions on structured metadata over the years, some of
which was captured in the [MetadataRoadmap Wiki
page|http://wiki.apache.org/tika/MetadataRoadmap].
I'd agree that we should strive to maintain backwards compatibility for simple
values.
I think we should also consider serialization of the metadata store, not just
in the {{Serializable}} interface sense, but perhaps being able to easily
marshal the entire metadata store into JSON and XML.
As [~gagravarr] points out, work has been done to express structured metadata
via the existing metadata store. In that email thread you'll find reference to
the external [tika-ffmpeg project|https://github.com/AlfrescoLabs/tika-ffmpeg].
> Introduce new HashMap<String, Object> data structure for persitsence of Tika
> Metadata
> -------------------------------------------------------------------------------------
>
> Key: TIKA-1607
> URL: https://issues.apache.org/jira/browse/TIKA-1607
> Project: Tika
> Issue Type: Improvement
> Components: core, metadata
> Reporter: Lewis John McGibbney
> Assignee: Lewis John McGibbney
> Priority: Critical
> Fix For: 1.9
>
>
> I am currently working implementing more comprehensive extraction and
> enhancement of the Tika support for Phone number extraction and metadata
> modeling.
> Right now we utilize the String[] multivalued support available within Tika
> to persist phone numbers as
> {code}
> Metadata: String: String[]
> Metadata: phonenumbers: number1, number2, number3, ...
> {code}
> I would like to propose we extend multi-valued support outside of the
> String[] paradigm by implementing a more abstract Collection of Objects such
> that we could consider and implement the phone number use case as follows
> {code}
> Metadata: String: Object
> {code}
> Where Object could be a Collection<HashMap<String/Property,
> HashMap<String/Property, String/Int/Long>> e.g.
> {code}
> Metadata: phonenumbers: [(+162648743476: (LibPN-CountryCode : US),
> (LibPN-NumberType: International), (etc: etc)...), (+1292611054:
> LibPN-CountryCode : UK), (LibPN-NumberType: International), (etc: etc)...)
> (etc)]
> {code}
> There are obvious backwards compatibility issues with this approach...
> additionally it is a fundamental change to the code Metadata API. I hope that
> the <String, Object> Mapping however is flexible enough to allow me to model
> Tika Metadata the way I want.
> Any comments folks? Thanks
> Lewis
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