Document Structure and Inheritance
XML, XHTML, and HTML documents have an implicit structure or hierarchy. For instance, the html
root element usually contains a head
and a body
, and the body
, in turn, contains some number of block-level elements, such as paragraphs (p
). A paragraph may include inline elements such as anchors (a
) or emphasized text (em
). This hierarchy can be visualized as a tree, branching out from the root. Figure 16-2 shows the document tree structure of a very simple XHTML document.
Figure 16-2. Document tree structure
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