Relationships of Nodes
There
are five types of relationships amongst nodes:
- Parent
- Child
- Sibling
- Ancestor
- Descendant
Parent
- Each element and attribute has one parent.
- Consider the following example; the book element is the parent of the title, author, year, and price:
<book>
<title
lang="en">Web Technologies</title>
<author>Kogent</author>
<year>2010</year>
<price>300.00</price>
</book>
Child
- Element nodes may have zero, one or more children
- Consider the following example; the title, author, year, and price elements are all children of the book element:
<book>
<title
lang="en">Web Technologies</title>
<author>Kogent</author>
<year>2010</year>
<price>300.00</price>
</book>
Sibling
- Nodes that have the same parent
- Consider the following example; the title, author, year, and price elements are all siblings:
<book>
<title
lang="en">Web Technologies</title>
<author>Kogent</author>
<year>2010</year>
<price>300.00</price>
</book>
Ancestor
- A node's parent, parent's parent, etc
- Considerthefdlowing example; the ancestors of the title element are the book element and the bookstore element:
<bookstore>
<book>
<title
lang="en">Web Technologies</title>
<author>Kogent</author>
<year>2010</year>
<price>300.00</price>
</book>
</bookstore>
Descendant
- A node's children, children's children, etc
- Consider the following example; descendants of the bookstore element are the book, title, author, year, and price elements:
<bookstore>
<book>
<title
lang="en">Web Technologies</title>
<author>Kogent</author>
<year>2010</year>
<price>300.00</price>
</book>
</bookstore>
