ElementTraversal (JAXP 1.4, DOM3, SAX2.0.2(sax2r3), StAX 1.0, SAC 1.3)

```
public interface ElementTraversal
```
The ElementTraversal interface is a set of read-only attributes which allow an author to easily navigate between elements in a document.
In conforming implementations of Element Traversal, all objects that implement Element must also implement the ElementTraversal interface. Four of the methods, getFirstElementChild(), getLastElementChild(), getPreviousElementSibling(), and getNextElementSibling(), each return a live reference to another element with the defined relationship to the current element, if the related element exists. The fifth method, getChildElementCount(), exposes the number of child elements of an element, for preprocessing before navigation.
See also the Element Traversal Specification.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`int`	`getChildElementCount()`	Returns the current number of element nodes that are children of this element.
`Element`	`getFirstElementChild()`	Returns the first child element node of this element.
`Element`	`getLastElementChild()`	Returns the last child element node of this element.
`Element`	`getNextElementSibling()`	Returns the next sibling element node of this element.
`Element`	`getPreviousElementSibling()`	Returns the previous sibling element node of this element.

- Method Detail
  - getFirstElementChild
```
Element getFirstElementChild()
```
    Returns the first child element node of this element. null if this element has no child elements.
  - getLastElementChild
```
Element getLastElementChild()
```
    Returns the last child element node of this element. null if this element has no child elements.
  - getPreviousElementSibling
```
Element getPreviousElementSibling()
```
    Returns the previous sibling element node of this element. null if this element has no element sibling nodes that come before this one in the document tree.
  - getNextElementSibling
```
Element getNextElementSibling()
```
    Returns the next sibling element node of this element. null if this element has no element sibling nodes that come after this one in the document tree.
  - getChildElementCount
```
int getChildElementCount()
```
    Returns the current number of element nodes that are children of this element. 0 if this element has no child nodes that are of nodeType 1.