In CX-310-220, 1.3 Describe the use of namespaces in an XML document. I noticed it is removed in CX-310-230.
I raised this question because I am totally new to namespace usage or Web service. My latest experience is implementing a default namespace for my application i am working on with JAXB. One of my colleague told me that he saw in some blogs that namespace is nuisance. When the usage is heavier, the application become complicated to handle especially using namespace as versioning control. Furthermore when the default namespace for example is different for the same xsd, exception would be thrown if we set it to be namespace awared for example using SAX Parser when unmarshalling. Is the usage of namespaces in XML document less important in future?