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Since version 1.11, eXo JCR implementation supports namespaces altering.
ExtendedNamespaceRegistry namespaceRegistry = (ExtendedNamespaceRegistry) workspace.getNamespaceRegistry();
namespaceRegistry.registerNamespace("newMapping", "http://dumb.uri/jcr");ExtendedNamespaceRegistry namespaceRegistry = (ExtendedNamespaceRegistry) workspace.getNamespaceRegistry();
namespaceRegistry.registerNamespace("newMapping", "http://dumb.uri/jcr");
namespaceRegistry.registerNamespace("newMapping2", "http://dumb.uri/jcr");