**if you want to see the next page, you click a crawlable link that goes to **
**mysite.com/main-category12-24 **
**The site does not offer a view all function. **
Would applying the rel canonical tag be appropriate in this instance, or do I have to let Google crawl and index each page independantly?
In this example you actually are talking about 2 different pages and in which case it can be appropriate to use the rel canonical.
Example take a look at a popular plateform like Oscommerce.
The Index.php page generates the following pages
- index.php
- category pages
- sub category pages
These are referenced by the software by the cPath (category Path) and would look much like this
- index.php
- index.php&cPath=1
- index.php&cPath=1_5
To a search engine these are all unique pages. Additionally, since many e-commerce platforms follow this type of module but also have ways to make the pages more SEO friendly you can in some cases access the same page via different URL's which is of course bad, due to duplicate content. In these case a rel canonical is very appropriate.
For example Oscommerce has a SEO friendly URL modification which turns the unspecific URL like index.php&cPath=1 into something like electronics.html However unless some sort of redirect is used you can actually access this page via either URL.
To simplify the answer the rel canonical tag is most appropriate for pages that generate dynamic URL's but content changes very little. In my examples above the pages are very different index.php and a index.php&cPath=1 page, however there can be times when you have interactions on those pages which would create a new url like say adding a product to the cart or a product selection filter, or any score of interactions that may change the url from index.php&cPath=1 to index.php&cPath=1&addToCart1&Product_ID=414&return in this case rel canonical would be very much appropriate as the page is not really changing you're just executing an action.