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Node release is based on the importance of the links: Links to parent nodes cannot be dropped because ancestors provide context for in-scope namespaces and it is difficult to retrieve dropped parent nodes using streaming APIs such as InfosetReader.
The scalable DOM always holds its parent and previous sibling strongly but holds its children and following sibling weakly.
When the Java Virtual Machine frees the nodes, references to them are still available in the underlying data so they can be recreated if needed. In this mode, the DOM depends on the application to explicitly dereference a document fragment from the whole tree. There are no weak references.
It is recommended that if an application has a deterministic order of processing the data, to avoid the extra overhead of repeatedly releasing and recreating nodes. To dereference a node from all other nodes, call freeNode on it. Note that dereferencing nodes is different from removing nodes from a DOM tree. The node can still be accessed and recreated from its parent, previous, and following siblings.
However, a variable that holds the node will throw an error when accessing the node after the node has been freed. When the copy method is used, it creates just the root node of the fragment being copied, and the subtree can be expanded on demand. Data sharing is for the underlying data, not the DOM nodes themselves.
The DOM specification requires that the clone and its original have different node identities, and that they have different parent nodes. Normal update operations are available and do not interfere with each other. This merges all the changes with the original data and serializes the data in persistent storage.
If you do not save a modified DOM explicitly, the changes are lost once the transaction ends. For additional scalability, the scalable DOM can use backend storage for binary data through the PageManager interface. Then, binary data can be swapped out of memory when not in use. This code example illustrates how to use the PageManager interface.
DOM creation is scalable when the attribute is set to TRUE and nodes that are not in use are freed and recreated when needed. Any attempt to modify the DOM tree results in an error, but node creation such as cloning is allowed, as long as the new nodes are not added to the DOM tree.
Following the concept of current node in stream mode, the current node is the last node that has been accessed in document order. Applications can hold nodes in variables and revisit them, but using the DOM method to access any node before the current node causes a DOM error.
However, accessing ancestor nodes and attribute nodes is always allowed. Therefore, the previous sibling link is not created. Therefore, it does not need to recreate any node that has been freed.
TRUE ; domimpl. The program receives an XML document, parses it, and prints the elements and attributes in the document. The principal difference is in printing the DOM tree, which is step 5.
The DOM2Namespace. To validate a document using DOM, ensure that there is no schema in the document, and no element prefix for our start and end tags. Line The created parser is namespace aware the namespace prefix will be dealt with as a prefix, and not a part of the element. Lines 18 — The created parser uses internal XSD to validate the document Dom BuilderFactory instances accept several features which let developers enable or disable a functionality, one of them is validating against the internal XSD.
The default handler has different behaviors based on the implementation that we use. Events can be a start element event, end element event, and so forth. It means that the parser client can ask the parser to go forward in the document when it needs.
Iterator-based API which represents the current state of the parser as an Object. The parser client can get all the required information about the element underlying the event from the object.
For example, if a start-tag appears without a corresponding end-tag, it is not well-formed. A document that is not well-formed is not considered to be XML. A valid document conforms to semantic rules.