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From "Grant Ingersoll (JIRA)" <j...@apache.org>
Subject [jira] Commented: (SOLR-284) Parsing Rich Document Types
Date Sun, 23 Nov 2008 00:11:45 GMT

    [ https://issues.apache.org/jira/browse/SOLR-284?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12649986#action_12649986
] 

Grant Ingersoll commented on SOLR-284:
--------------------------------------

{quote}
I think I like where this is going.
{quote}

Great!  I think the nice thing is as Tika grows, we'll get many more formats all for free.
 For instance, I saw someone working on a Flash extractor.

{quote}
Currently the default is ext.ignore.und.fl (IGNORE_UNDECLARED_FIELDS) == false, which means
that if Tika returns a metadata field and you haven't made an explicit mapping from the Tika
fieldname to your Solr fieldname, then Solr will throw an exception and your document add
will fail. This doesn't seem sound very robust for a production environment, unless Tika will
only ever use a finite list of metadata field names. (That doesn't sound plausible, though
I admit I haven't looked into it.) Even in that case, I think I'd rather not have to set up
a mapping for every possible field name in order to get started with this handler. Would true
perhaps be a better default?
{quote}

I guess I was thinking that most people will probably start out with this by sending their
docs through the engine and see what happens.  I think an exception helps them see sooner
what they are missing.  That being said, I don't feel particularly strong about it.   It's
easy enough to set it to true in the request handler mappings.    From what I see of Tika,
though, the possible values for metadata is fixed within a version.  Perhaps the bigger issue
is what happens when someone updates Tika to a newer version with newer Metadata options.

{quote}
ext.capture / CAPTURE_FIELDS: Do you have a use case in mind for this feature, Grant? The
example in the patch is of routing text from <div> tags to one Solr field while routing
text from other tags to a different Solr field. I'm kind of curious when this would be useful,
especially keeping in mind that, in general, Tika source documents are not HTML, and so when
<div> tags are generated they're as much artifacts of Tika as reflecting anything in
the underlying document. (You could maybe ask a similar question about ext.inx.attr / INDEX_ATTRIBUTES.)
{quote}

For capture fields, it's similar to a copy field function.  Say, for example, you want a whole
document in one field, but also to be able to search within paragraphs.  Then, you could use
a capture field on a <p> tag to do that.  Thus, you get the best of both worlds.  The
Tika output, is XHTML.

Also, since extraction is happening on the server side, I want to make sure we have lots of
options for dealing with the content.  I don't know where else one would have options to muck
with the content post-extraction, but pre-indexing.  Hooking into the processor chain is too
late, since then the Tika structure is gone.  That's my reasoning, anyway.  

Similarly, for index attributes.  When extracting from an HTML file, and it comes across anchor
tags (<a>) it will provide the attributes of the tags as XML attributes.  So, one may
want to extract out the links separately from the main content and put them into a separate
field.

> Parsing Rich Document Types
> ---------------------------
>
>                 Key: SOLR-284
>                 URL: https://issues.apache.org/jira/browse/SOLR-284
>             Project: Solr
>          Issue Type: New Feature
>          Components: update
>            Reporter: Eric Pugh
>            Assignee: Grant Ingersoll
>             Fix For: 1.4
>
>         Attachments: libs.zip, rich.patch, rich.patch, rich.patch, rich.patch, rich.patch,
rich.patch, rich.patch, SOLR-284.patch, SOLR-284.patch, solr-word.pdf, source.zip, test-files.zip,
test-files.zip, test.zip, un-hardcode-id.diff
>
>
> I have developed a RichDocumentRequestHandler based on the CSVRequestHandler that supports
streaming a PDF, Word, Powerpoint, Excel, or PDF document into Solr.
> There is a wiki page with information here: http://wiki.apache.org/solr/UpdateRichDocuments
>  

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