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It should be followed but not indexed,

Does google and other search engines considers the class and id names as part of text content. Will it be included in the keyword density and treated as a content.

For Example:

<a <span="">href</a><a <span="">="http://xyz.com" title="xyz" class="topmargin_rightside_middlenavigation_home"></a>

Will google considers the words "topmargin rightside middlenavigation home" as part of the text.

Also If i am supposed to use this class as many times on a page, will the keyword density affects.

One of my campaign has got around 8500 pages crawled(seomoz) and reports are shown, but suddenly it is showing 1 page crawled. Why it is happened like this?

How can i get back the previous reports?

It should be followed but not indexed,