What are these means for SEO?
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Geo Meta Tags
Dublin core
Microformats
What are they and If they are helpful for SEO purposes.How can i set them?My site is in wordpress.
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Geo Meta tags are simply what they sound like - they are meta tags that allow you to declare your geo-location (longitude/latitude) - they may have some impact on local searches or searches using location identifiers.
Microformats are schemas used to help crawlers understand your content better. I would recommend looking in to using schema.org formatting - or, at the very least, use V-Card formatting on your physical address in the content of your site.
As far as Dublin Core meta data - read this. http://dublincore.org/documents/dces/
Of course you can always ask anything here in the forums but Google is a good tool too

Cheers!
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Billy can you please describe the process of Geo META TAGS.The reasin why I added wordpress is that I want to know any easy method like plugin or other thing to make these things working.
I see rarely very few sites considering these things?