defines the document format for configuration update documents. Updates are increments to default documents like a component schema and contain additional information for merging and access control adds the xml:lang attribute for localized information. Only the update format is allowed to contain localized data. Identifies a node in the schema by it's name and position within the hierarchy. Overrides or adds information from the base layer. A node can be of type set or group. adds operational info to a property, should only be applied for dynamic properties. Dynamic properties are not available in the component schema and are added or removed during runtime. defines a list of possible operations, which are applied during merging of node fragments. indicates that the content of a node and its descendant nodes are not allowed to be overwritten. specifies that a node MUST be present and can not be removed or replaced by a node during the merging process. determines, whether a node and its descendants are readonly or not. This is a computed attribute and can not be set by an application. root element of the update document.