http://static.googleusercontent.com/...rter-guide.pdf
I don't know when the above was written, but take a look at page 8 and 9 dealing with urls.
In summary, although google can read dynamic urls, re-written urls can enhance customer experience...which apparently is where google is at now. Also, even though Google can read/crawl a dynamic url, a re-written url can help Google understand what the page is about.
Snippet:
"Google is good at crawling all types of URL structures, even if they're quite complex, but spending the time to make your URLs as simple as possible for both users and search engines can help. Some webmasters try to achieve this by rewriting their dynamic URLs to static ones; while Google is fine with this, we'd like to note that this is an advanced procedure and if done incorrectly, could cause crawling issues with your site."
Snippet:
"Some users might link to your page using the URL of that page as the anchor text. If your URL contains relevant words, this provides users and search engines with more information about the page than an ID or oddly named parameter would"
I cannot even tell what my dynamic urls refer to on my main site.
So, it apparently is not about Google being to read/crawl; it's about customer experience. But be careful and do it right!
This may be outdated, I do not know.
sph
www.prom-mart.com
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