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When attempting to transform elements with namespace prefixes, the transformer locators throw an error:
Failure/Error: return parent_source_node.xpath(xpath) Nokogiri::XML::XPath::SyntaxError: ERROR: Undefined namespace prefix: a:basictransforms_namespace_replace

Example source:
<basictransforms_namespace xmlns:a="http://a/"> <a:basictransforms_namespace_replace a="aaa" /> </basictransforms_namespace>

Example transform
<basictransforms_namespace xmlns:a="http://a/"> <a:basictransforms_namespace_replace b="bbb" xdt:Transform="Replace" /> </basictransforms_namespace>

Summary:
If transform XML contains default namespaces (e.g. ) the transformation will fail with an uncaught exception, such as:
Nokogiri::XML::XPath::SyntaxError:
ERROR: Invalid expression: :tag

Expected behavior:
Default namespaces are handled in the same manner as aliased namespaces, using them to select the correct nodes (ones with the same namespace)