Xing is Europe's leading Business Network with more than 2 million members. Recently, Xing announced that they would come up with an API later this year to get access to the network. As far as I know, Xing was developed by ePublica using Perl and MySQL.
Having an API is essential in these mashup days. I was invited to the private alpha test and implemented a reference implementation of an API client via PHP5 which behaves like SOAPClient (but uses ReST as the transport mechanism) and overloads the methods that are available.
Here's an example of how to call it currently (API is …[Read more]