[ 
http://issues.apache.org/jira/browse/NUTCH-192?page=comments#action_12365618 ] 

Doug Cutting commented on NUTCH-192:
------------------------------------

Since these mappings are not something that users should alter, I'm not sure 
they should be in the config file.  I added related mappings to static code in 
NutchConfigurable.  Every Nutch invocation should reference that class, so 
adding registrations like there ensures they'll always be exectuted.  So, in 
any case, if they're loaded from a resource (config file or otherwise) the 
loading should probably happen in NutchConfigurable.  Putting it in a static 
block there means it isn't reloaded for each configuration, but, e.g., if 
plugins need to register new mappings, then perhaps we'll need to reload these 
resources each time a configuration is constructed.

> meta data support for CrawlDatum
> --------------------------------
>
>          Key: NUTCH-192
>          URL: http://issues.apache.org/jira/browse/NUTCH-192
>      Project: Nutch
>         Type: Improvement
>     Versions: 0.8-dev
>     Reporter: Stefan Groschupf
>      Fix For: 0.8-dev
>  Attachments: metadata010206.patch, metadata060206.patch, 
> metadata300106.patch, metadata310106.patch
>
> Supporting meta data in CrawlDatum would help to get a set of new nutch 
> features realized and makes a lot possible to smaller special focused search 
> engines.

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