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132 Part III .Document Objects Reference nextSibling previousSibling Value: Object reference Read-Only NN2 NN3 NN4 NN6 IE3/J1 IE3/J2 IE4 IE5 IE5.5 Compatibility A sibling element is one that is at the same nested level as another element. For example, the following P element has two child nodes (the EM and SPAN elements). Those two child nodes are siblings of each other.

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Sibling order is determined solely by the source code order of the elements. Therefore, in the previous example, the EM element has no previousSibling property. Meanwhile, the SPAN element has no nextSibling property (meaning that these properties return null). These properties provide another way to iterate through all elements at the same level. Example on the CD-ROM Related Items: firstChild, lastChild, childNodes properties; hasChildNodes(), insertAdjacentElement() methods. nodeName Value: String Read-Only NN2 NN3 NN4 NN6 IE3/J1 IE3/J2 IE4 IE5 IE5.5 Compatibility For HTML and XML elements, the name of a node is the same as the tag name. The nodeName property is provided for the sake of consistency with the node architecture specified by the formal W3C DOM standard. The value, just like the tagName property, is an all-uppercase string of the tag name (even if the HTML source code is written with lowercase tags). Some nodes, such as the text content of an element, do not have a tag. The nodeName property for such a node is a special value: #text. Another kind of node is an attribute of an element. For an attribute, the nodeNameis the name of the attribute. See Chapter 14 for more about Node object properties. On the CD-ROM elementObject.nodeName
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131Chapter 15 .Generic HTML Element Objects Example on the CD-ROM Related Items: AREA, SELECT, OPTION, and Array objects. localName namespaceURI prefix Value: String Read-Only NN2 NN3 NN4 NN6 IE3/J1 IE3/J2 IE4 IE5 IE5.5 Compatibility The three properties, localName, namespaceURI, and prefix, apply to any node in an XML document that associates a Namespace URI with an XML tag. Although NN6 exposes all three properties for all element (and node) objects, the properties do not return the desired values. Future versions of NN6 should remedy the situation. In the meantime, this description provides a preview of what values these three properties will represent. Consider the following XML content: To Kill a Mockingbird The element whose tag is is associated with the Namespace URI defined for the block, and the element s namespaceURIproperty would return the string http://bigbooks.org/schema. The tag name consists of a prefix (before the colon) and the local name (after the colon). In the above example, the prefix property for the element defined by the tag would be bk, while the localName property would return title. The localName property of any node returns the same value as its nodeName property value, such as #text for a text node. For more information about XML Namespaces, visit http://www.w3.org/TR/ REC-xml-names. Related Items: scopeName, tagUrn properties. On the CD-ROM elementObject.localName
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130 Part III .Document Objects Reference (or any other non-JScript-compatible language installed with your browser), you do not need to modify this property (or read it, for that matter). Valid values include JScript, javascript, vbscript, and vbs. Third-party scripting engines have their own identifier for use with this value. Because the LANGUAGE attribute is also used in the