[](name) public

Fetches an attribute value. If you want to get the Attribute itself, use get_attribute()

name:an XPath attribute name. Namespaces are relevant here.
Returns:the String value of the matching attribute, or nil if no matching attribute was found. This is the unnormalized value (with entities expanded). 
 doc = Document.new "<a foo:att='1' bar:att='2' att='&lt;'/>"
 doc.root.attributes['att']         #-> '<'
 doc.root.attributes['bar:att']     #-> '2'
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