namespace(prefix=nil) public

Evalutas to the URI for a prefix, or the empty string if no such namespace is declared for this element. Evaluates recursively for ancestors. Returns the default namespace, if there is one.

prefix:the prefix to search for. If not supplied, returns the default namespace if one exists
Returns:the namespace URI as a String, or nil if no such namespace exists. If the namespace is undefined, returns an empty string
 doc = Document.new("<a xmlns='1' xmlns:y='2'><b/><c xmlns:z='3'/></a>")
 b = doc.elements['//b']
 b.namespace           # -> '1'
 b.namespace("y")      # -> '2'
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