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@@ -3,10 +3,23 @@ require 'lib/uriref'
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 class Namespace
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   def initialize(uri, short)
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     @uri = uri
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-    @short = short
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+    if shortname_valid?(short)
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+      @short = short
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+    else
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+      raise
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+    end
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   end
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   def method_missing(methodname, *args)
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     URIRef.new(@uri + methodname.to_s)
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   end
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+  
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+  private
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+  def shortname_valid?(shortname)
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+    if shortname =~ /[a-zA-Z_][a-zA-Z0-9_]+/
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+      return true
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+    else
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+      return false
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+    end
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+  end
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 end
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\ No newline at end of file

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@@ -12,7 +12,9 @@ describe "Namespaces" do
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   end
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   it "should have an XML and N3-friendly prefix" do
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-    pending "TODO: Thinking about how to test XML and N3 friendliness"
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+    lambda do
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+      test = Namespace.new('http://xmlns.com/foaf/0.1/', '*~{')
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+    end.should raise_error
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   end
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   it "should be able to attach to the graph for substitution" do