Yahoo Gets Rid of Duplicate Content Issues
Yahoo has devised a way to get rid of duplicate content issues on their search engine. The company has been taking big strides in helping control the duplicate content issue. Recently it has launched the use of the <link> tag which helps by documenting the preferred URL to access each web page.
You simply do this by placing a <link> tag to the <head> section of your page content. This is how the tag looks: <link rel=”canonical” href=”http://www.example.com/products” />. This indicates to the crawler that the URL it is on should be represented as this http://www.example.com/products. It eliminates certain duplicates.
You can also place the canonical URL form for crawlers to use on each page content. Doing this makes it available for crawlers to use no matter what source of variance is present in the URL form to be used to access the page.
It is advisable that the URLs in the <link> tag are absolute to minimize the chance for errors although it can work for both absolute and relative URLS.
A <link> tag can only indicate to a canonical URL that belongs to the same domain but not across.
Of course Yahoo still has to verify with its algorithmic mechanics even if it considers the <link> tag information. This is to avoid further system problems in case the <link> tag is not used to serve its purpose.
The <link> tag is the same as that of 301 redirects when it comes to transferring link references to the canonical form of the page.
The <link> tag is also transitive, which means that if A treats B as canonical and B treats C as canonical as well then that makes C canonical for both A and B.
There is also another means of resolving duplicate content issues. It’s by using the Rewrite Dynamic URLs feature of Site Explorer. You merely have to authenticate the site in Site Explorer and create a URL Rewriting Rule.
- March 10th
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