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https://issues.apache.org/jira/browse/SOLR-5228?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13944971#comment-13944971
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Benson Margulies commented on SOLR-5228:
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DTD's are useless. We need to pick one of W3C XML Schema or RNG. RNG is a lot
easier to work with. Schematron is another possibility, but I have no
experience. See
http://docs.oracle.com/javase/7/docs/api/javax/xml/validation/package-summary.html.
Choices are:
* validation is easy to disable; people who customize disable it
* customizers take the entire schema, add to it, and provide their added one.
Not so good for multiples.
* customizers are constrained to use _namespaces_ -- you customize, you add an
XML namespace, and you provide a schema for your namespace.
Of course the first time we try this we'll find problems in the test schemas.
Has anyone done anything in this area that I could start from if I was inclined
to try to work on this?
> Deprecate <fields> and <types> tags in schema.xml
> -------------------------------------------------
>
> Key: SOLR-5228
> URL: https://issues.apache.org/jira/browse/SOLR-5228
> Project: Solr
> Issue Type: Improvement
> Components: Schema and Analysis
> Reporter: Hoss Man
> Assignee: Erick Erickson
> Fix For: 4.8, 5.0
>
> Attachments: SOLR-5228.patch, SOLR-5228.patch
>
>
> On the solr-user mailing list, Nutan recently mentioned spending days trying
> to track down a problem that turned out to be because he had attempted to add
> a {{<dynamicField .. />}} that was outside of the {{<fields>}} block in his
> schema.xml -- Solr was just silently ignoring it.
> We have made improvements in other areas of config validation by generating
> statup errors when tags/attributes are found that are not expected -- but in
> this case i think we should just stop expecting/requiring that the
> {{<fields>}} and {{<types>}} tags will be used to group these sorts of
> things. I think schema.xml parsing should just start ignoring them and only
> care about finding the {{<field>}}, {{<dynamicField>}}, and {{<fieldType>}}
> tags wherever they may be.
> If people want to keep using them, fine. If people want to mix fieldTypes
> and fields side by side (perhaps specify a fieldType, then list all the
> fields using it) fine. I don't see any value in forcing people to use them,
> but we definitely shouldn't leave things the way they are with otherwise
> perfectly valid field/type declarations being silently ignored.
> ---
> I'll take this on unless i see any objections.
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