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Import/Export
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.. function:: model.loadXmlModels(filePath(s) | url(s) | fileContent)

  Load XML models from the file.

  :filePath: File path to XML model.
  :url: URL to XML model.
  :fileContent: Content of XML model.

  For every new model new namespace is created with next index after last added namespace.
  Namespace index 0 reserved for default namespace 'http://opcfoundation.org/UA/'.
  If model with same URI already exists, it will be merged with the new one.

.. function:: model.exportXml(output, [namespaceUris])

  Export XML models to the file. If namespaceUris is not provided, all namespaces will be exported.

  :output: File path or callback function to export XML models.
  :namespaceUris: Array of namespace URIs to export.

  :returns: nil
  :throws: error in case of errors.