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Namespace-based Validation Dispatching Language
Namespace-based Validation Dispatching Language (NVDL) is an XML schema language for validating XML documents that integrate with multiple namespaces. It is an ISO/IEC standard, and it is Part 4 of the DSDL schema specification. Much of the work on NVDL is based on the older Namespace Routing Language.
== Validation ==
Most XML languages are based on a single XML namespace. The expectation in these cases is that XML elements in a particular namespace belong to that language, and elements in another namespace belong to another language. Many XML languages allow the use of arbitrary elements from other namespaces.
The problem arises during the attempt to validate these hybrid documents. Each language is defined by a specific XML schema, but there is no linkage between the schemas.
The purpose of NVDL is to provide that linkage, based on namespaces. By associating a schema validator with an NVDL schema, the validator can use multiple schemas to validate a single document, switching between them based on the namespaces used in that document.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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