Invoking Web Services from a Mashup

An article written by me titled "Invoking Web Services from a Mashup" has been published on the WSO2 Oxygen Tank. Invoking external web services is a popular mechanism to get information to mashup with and this articles explains how this could be done on the WSO2 Mashup Server. The article covers the following,

• Mechanisms that the WSO2 Mashup Server provides to invoke web services
• The pros and cons of each mechanism
• An example showing how each of these mechanisms could be used to invoke a web service in a synchronous as well as asynchronous manner. It also gives an example as to how a secure service could be accessed.