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This all works fine without namespaces, but if different teams start working on different files, then you have the possibility of name clashes, and it would not always be obvious where a definition had come from.
The solution is to place the definitions for each schema file within a distinct namespace.
By using the Oxygen Compare Directories tool, you can compare and merge Office (OOXML) files, or other ZIP-based archives, seamlessly.
The archive files are presented as directories, allowing you to use the usual comparison and merge operations inside them.
So in our example above each of the 4 schema files could have a distinct target Namespace value. This schema defines the entity Customer Type, which makes use of the Address Type defined in the Common schema. First we need to import that schema into this one - so we can see it.
This is done using So in order to make use of the Address Type which is defined in Common Types.xsd, and part of the namespace " Test.com/Common Types", we must fully qualify it.
So far in this tutorial we have largely ignored namespaces as they are an added complexity over writing and using basic XSDs.
The full set of namespace rules are very complex, be this overview will provide a basic outline of the technology.
Oxygen provides powerful support for editing and validating documents from the Office Open XML zipped package.
The general rules for this are: The alias must be the same as the target namespace in which the element is defined.
It is important to note that this is where the element is defined - not where the complex Type is defined.
The NVDL schema can be easily customized to allow user-defined extension schemas for use in the OOXML files.
See the ECMA Markup Compatibility and Extensibility PDF document for more details.