Adds a new attribute. If an attribute with the same local name and namespace
URI is already present on the element, its prefix is changed to be the prefix
part of the qualifiedName, and its value is changed to be the value parameter.
This value is a simple string; it is not parsed as it is being set. So any markup
(such as syntax to be recognized as an entity reference) is treated as
literal text, and needs to be appropriately escaped by the implementation
when it is written out. In order to assign an attribute value that contains
entity references, the user must create an Attr node plus any Text and
EntityReference nodes, build the appropriate subtree, and use setAttributeNode
to assign it as the value of an attribute.
Per the XML Namespaces specification, applications must use the value null
as the namespaceURI parameter for methods if they wish to have no namespace.
Adds a new attribute. If an attribute with the same local name and namespace URI is already present on the element, its prefix is changed to be the prefix part of the qualifiedName, and its value is changed to be the value parameter. This value is a simple string; it is not parsed as it is being set. So any markup (such as syntax to be recognized as an entity reference) is treated as literal text, and needs to be appropriately escaped by the implementation when it is written out. In order to assign an attribute value that contains entity references, the user must create an Attr node plus any Text and EntityReference nodes, build the appropriate subtree, and use setAttributeNode to assign it as the value of an attribute. Per the XML Namespaces specification, applications must use the value null as the namespaceURI parameter for methods if they wish to have no namespace.