Page 118 - DCAP202_Fundamentals of Web Programming

Unit 9: DOM Model

taken from an HTML document: Notes
<TABLE>
<ROWS>
<TR>
<TD>Shady Grove</TD>
<TD>Aeolian</TD>
</TR>
<TR>
<TD>Over the River, Charlie</TD>
<TD>Dorian</TD>
</TR>
</ROWS>
</TABLE>
The Document Object Model represents this table like Figure 9.1.
Figure 9.1: DOM Representation of the Example Table

The name “Document Object Model” was chosen because it is an “object model” is used in the
traditional object oriented design sense: documents are modeled using objects, and the model
encompasses not only the structure of a document, but also the behavior of a document and the
objects of which it is composed. In other words, the nodes in the above diagram do not represent
a data structure, they represent objects, which have functions and identity. As an object model,
the Document Object Model identifies:

 the interfaces and objects used to represent and manipulate a document
 the semantics of these interfaces and objects – including both behavior and attributes
 the relationships and collaborations among these interfaces and objects
The Document Object Model currently consists of two parts, DOM Core and DOM HTML. The
DOM Core represents the functionality used for XML documents, and also serves as the basis for
DOM HTML.

!

Caution All DOM implementations must support the interfaces listed as “fundamental” in
the Core specification; in addition, XML implementations must support the interfaces
listed as “extended” in the Core specification.

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