[wp-trac] [WordPress Trac] #5454: Additional metadata in wxr export format

[WordPress Trac]

#5454: Additional metadata in wxr export format
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 Reporter:  tellyworth   |       Owner:  anonymous
     Type:  enhancement  |      Status:  new      
 Priority:  normal       |   Milestone:  2.5      
Component:  General      |     Version:           
 Severity:  normal       |    Keywords:           
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 The enclosed patch adds some extra metadata to the wxr xml export file to
 help support future enhancements and fixes for the importer.  The changes
 should be backwards compatible with previous versions of the importer
 code.

 * There's a new <wp:wxr_version> tag in the channel element that contains
 a version number indicating the wxr format version (currently 1.0).  The
 same number is in the xmlns:wp attribute but I included it here for easier
 access using the importer's get_tag() method; and also so we can
 distinguish between this version (which has the new tags listed below) and
 previous versions.  We should bump the version number iff there is a
 change that might affect backwards compatibility.

 * Two new tags <wp:base_site_url> and <wp:base_blog_url> are there to help
 the importer know whether it is importing from a different site or the
 same site.  In a normal WP install both tags contain the same URL (i.e.
 siteurl).  In MU, base_site_url will show the main url of the MU install,
 base_blog_url is the individual blog's url.

 * <category> tags now include a nicename attribute so it's possible to fix
 bug #5447.  Each category/tag element is duplicated because the old and
 existing importer code won't parse the new elements.

 * A new <wp:attachment_url> element is added when post_type is
 'attachment'.  Normally it's the same as the guid but that is not
 necessarily a reliable assumption for the importer to make.

 * A new <wp:comment_user_id> is included in comments.  The importer could
 check the <wp:base_site_url> and preserve this value when importing a wxr
 file from the same site.

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Ticket URL: <http://trac.wordpress.org/ticket/5454>
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