If you are using Tamino 3.1 you use the Schema Editor to produce a Tamino TSD3 Schema and define it in Tamino. Essentially a TSD3 Schema is an annotated W3C Schema.
I did this and tried to load the data. I got an error because the schema doesn’t define the xsi namespace. I then remove the xsi declaration and attribute from the root node od the INSTANCE and it loads successfully.
If youare using Tamino 2.3 you will have to create a TSD2 schema.
Before I we go any furthe I would like to know which version of Tamino you are using and whether the xsi hint is used by the application.
I use Tamino 3.1.1 I produce a .tsd file using schema editor,and then I define it using interactive interface,it successful. But when I process the .xml file,it still show the same error as above.(I remove all the attribute of root node,including xsi)