OpenGraph for Java

Due to the lack of useful native DOM parsers this class implements the HTMLCleaner library.

The class is good implementation of the OpenGraph protocol, being recommended by the service itself for Java apps.

Here are some key features of "OpenGraph for Java":

· Hashtable like representation of an Open Graph page
· Output to HTML (render the meta data back out as tags)
· Create OG data from scratch (the ability to use this class as a reverse and generate OG meta tags)