Tumblr’s API allows XML access to post content and related information.
For example, this link:
http://demo.tumblr.com/api/read
… it returns this XML file (truncated for this post):
<tumblr version=”1.0″>
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<tumblelog name=”demo” timezone=”US/Eastern” title=”Demo”>
Lorem ipsum dolor sit amet, consectetuer adipiscing elit, sed diam nonummy nibh euismod tincidunt ut laoreet dolore magna aliquam erat volutpat.
</tumblelog>
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<posts start=”0″ total=”6″>
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<post id=”236″ url=”http://demo.tumblr.com/post/236″ url-with-slug=”http://demo.tumblr.com/post/236/it-does-not-matter-how-slow-you-go-so-long-as-you” type=”quote” date-gmt=”2006-11-08 19:27:00 GMT” date=”Wed, 08 Nov 2006 14:27:00″ unix-timestamp=”1163014020″ format=”html” reblog-key=”iKvmNy9T” slug=”it-does-not-matter-how-slow-you-go-so-long-as-you”>
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<quote-text>
It does not matter how slow you go so long as you do not stop.
</quote-text>
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<quote-source>
Wisdom of <a href=”http://en.wikipedia.org/wiki/Confucius”>Confucius</a>
</quote-source>
<tag>wisdom</tag>
</post>