Sitemaps VS. Internal Link
Interestingly, though I had placed a sitemap on a blog set up on a sub-path of this domain, Google crawled, but did not index the content on that blog. I then created a post on the main article that had a link to the blog in the path. Shortly after, Google indexed some of the content in the path. The value of internal links is expressed in this example. Google gave more priority to content that was linked internally from another page on the same domain than it did to inclusion in a sitemap. This same concept applies to deep linking to content in your website pages from outside sources.
