Release 10.1A: OpenEdge Development:
Programming Interfaces

> ## The DOM structure model

> The DOM presents documents as a hierarchy or tree of node objects that also implement other, more specialized interfaces. Some types of nodes may have child nodes of various types, and others are leaf nodes that cannot have anything below them in the document structure. The node types, and which node types they may have as children, are shown in Table 19–1.

> Table 19–1: Node interface types
> Node interfaces | Description | Children
> --- | --- | ---
> DocumentType | Represents the Document Type Definition or Schema declaration of the XML document. | Notation, Entity
> DocumentFragment | Represents a lightweight object used to store sections of an XML document temporarily. | Element, ProcessingInstruction, Comment, Text, CDATASection, EntityReference
> EntityReference | Represents a reference to an entity within the XML document. | Element, ProcessingInstruction, Comment, Text, CDATASection, EntityReference
> Element | Represents an element node. This interface represents the data, or the tags of the XML document. The text of the element is stored in a Text or CDATASection node, which is the child of the element. | Element, Text, Comment, ProcessingInstruction, CDATASection, EntityReference
> Attribute | Represents an attribute of a document or an element. The allowable values for the attribute are defined in a document type definition. Attributes are NOT considered as child nodes of the element they describe. | Text, EntityReference
> CDATASection | CDATA sections are used to escape blocks of text that would otherwise be regarded as markup. The primary purpose is for including XML fragments, without needing to escape all the delimiters. | None
> Comment | Represents the content of a comment. | None
> Entity | Represents an entity, either parsed or unparsed, in the XML document. | None
> Notation | Represents a notation declared within the DTD. | None
> ProcessingInstruction | The “Processing Instruction” is a way to keep processor-specific information in the text of the document. | None
> Text | Represents a Text node that is a child of an element node. | None

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