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https://issues.apache.org/jira/browse/SOLR-2597?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13050406#comment-13050406
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Robert Muir commented on SOLR-2597:
-----------------------------------
yes, the factories are long-lived and do expensive things up-front to configure
themselves (parsing files etc)
> XmlCharFilter
> -------------
>
> Key: SOLR-2597
> URL: https://issues.apache.org/jira/browse/SOLR-2597
> Project: Solr
> Issue Type: Improvement
> Components: Schema and Analysis
> Affects Versions: 4.0
> Reporter: Mike Sokolov
> Attachments: SOLR-2597.patch
>
>
> This CharFilter processes incoming XML using the Woodstox parser, stripping
> all non-text content and remembering offsets, just like HTMLCharFilter, but
> respecting XML conventions like XML entities defined in a DTD. XmlCharFilter
> also provides the ability to exclude (and include) the content of certain
> named elements.
> In order to compute character offsets properly when mixed line termination
> styles are present (\r, \r\n), or when XML character entities (<, ",
> &) are present, we require a newer version of Woodstox (4.1.1) than is
> currently in solr/lib. The earlier versions of the parser could not report
> these entity events, so we couldn't tell the difference between "<" and
> "<" and the offsets could be wrong. The upgraded version is in the patch.
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