Introduction To Dom
- 1. CIS-189
- 2. DOM stands for Document Object Model Provides tools for working with XML document in memory ◦ Tools include navigating and editing document ◦ “Interface” refers to how you interact with an object What is accessible outside of object?
- 3. XML document in memory called XML Information Set or Infoset DOM is a logical model ◦ How represented in memory may be different from how document exists on disk ◦ Uses Nodes to represent XML Tree and contents
- 4. Moving data from active memory to disk Serialization moves data from objects in memory to disk Deserialization moves data from disk to objects in memory
- 5. Defines what interfaces (tools) will be provided ◦ Focus is on results ◦ Doesn’t specify how a tool will work Software providers can provide additional tools ◦ IE might process instructions that Firefox can’t
- 6. Node represents the basic object in a document ◦ Different kinds of nodes represent different purposes and values ◦ All types of nodes inherit same initial definition One node can “own” another node ◦ Function similar to Windows tree-view of file system ◦ Type of node can affect how object responds to code
- 8. Document Document Type Document Fragment Element Entity Reference Entity Attribute Processing Instruction Comment CDATA Text Notation
- 9. Different types of nodes can have different types of child nodes, or no child nodes Document node represents highest level ◦ Document node can have Element, Document type, Processing Instruction, Comment nodes ◦ Document type, Processing instruction, Comment nodes cannot have child nodes
- 11. Can have as child nodes: Element, Comment, Processing instruction, Text, CDATA, Entity reference Attributes of an element exist in Attribute nodes ◦ Attribute nodes are not considered child and are not part of DOM tree
- 13. Portion of an XML document Has same “ownership” possibilities as an Element Does NOT have to be well-formed Isn’t a complete XML document