Dynamic Sites and Navigation
All the effort needed to optimise every page is only useful if the pages can be crawled successfully but a robot spider. Dynamic sites producing “id=?” with large query strings are generally not easily penetrated. In situations like this you may need to consider URL rewriting.
At best this means that the migration of PageRank (Google’s measure of a pages importance) is poor.
Text navigation is preferred by most engines. A search engine spider can understand a link that is text. Image links are generally not so well understood although alttags are helpful.
The use of java navigation, flash or other more adventurous navigation systems are often completely invisible to spiders.
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