Declarations : include « XML Schema « XML Tutorial

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<include schemaLocation=""> 


The <include> declaration combines XML Schemas that are designed for the same targetNamespace(or no targetNamespace). 
Within the <include> declaration there is no namespace attribute. 
The <include> declaration can be used only on documents with the same targetNamespace, or no targetNamespace.
When a schema validator encounters an <include> declaration, it treats the global declarations from the included XML Schema as 
  if they had been declared in the XML Schema that contains the <include> declaration.