Subject: [xsl] Microsoft, Yahoo, and Google agree on canonical link tag From: "M. David Peterson" <xmlhacker@xxxxxxxxx> Date: Fri, 13 Feb 2009 07:28:16 -0700 |
I hope to have time later today to write up a more lengthy review, but for now, it seems there are probably a few folks on this list that will find interest in the summary located @ http://xmlhacker.com/news/microsoft-yahoo-google_canonical-link-tag.html > Microsoft, Yahoo, and Google have announced an agreed upon format for content creators and webmasters to declare multiple pages reached via multiple URI's as > being one in the same. In short: <link rel="canonical" href="http://example.com/foo.html"/> can be declared inside the /html/head element of http://example.com/?page=foo, > http://example.com/?category=foo, http://example.com/news/foo.html, etc. and the top three search engines based on market share will treat all three as the same, indexing > and linking to the canonical URI of http://example.com/foo.html rather than all three. I believe this presents a /much/ needed tool for the browser-based XSLT developer as it provides the ability to use both PI and JavaScript based transformations of content within the browser without paying the "dynamically generated content doesn't get indexed" cost that up until now was a significant concern for a lot of folks. The one requirement, of course, is using a static XHTML source file for each URI that is served up to all requesting clients with the proper canonical URI embedded in the href attribute of an /html/head/link element that points to a statically rendered, and therefore indexable, version of the same content that's rendered dynamically via either a PI invoked transformation and/or JavaScript-based transforms that are invoked during and/or after the document loading process on clients that support client-side transformations. A small price to pay, in my own opinion, to gain the advantages of both client-side transformations and Google, MSFT, and Yahoo properly indexing your sites content. Links to announcements [1,2,3] [1] http://blogs.msdn.com/webmaster/archive/2009/02/12/partnering-to-help-solve-duplicate-content-issues.aspx [2] http://ysearchblog.com/2009/02/12/fighting-duplication-adding-more-arrows-to-your-quiver/ [3] http://googlewebmastercentral.blogspot.com/2009/02/specify-your-canonical.html -- /M:D M. David Peterson Co-Founder & Chief Architect, 3rd&Urban, LLC Email: m.david@xxxxxxxxxxxxxxx | m.david@xxxxxx Mobile: (206) 999-0588 http://3rdandUrban.com | http://amp.fm | http://broadcast.oreilly.com/m-david-peterson/
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