Scala XML Namespace wrangling

xml-namespace.scala

object XmlRewriteUtil {
  def rewriter(f: PartialFunction[Node, NodeSeq]): RuleTransformer = new RuleTransformer(rule(f))

  def rule(f: PartialFunction[Node, NodeSeq]): RewriteRule = new RewriteRule {
    override def transform(n: Node) = if (f.isDefinedAt(n)) f(n) else n
  }
}

  def setNamespace(node: Node, prefix: String, namespace: String): Node = {
    import XmlRewriteUtil._

    rewriter {
      case e: Elem if e == node => e.copy(scope = NamespaceBinding(prefix, namespace, parent = e.scope))
      case e: Elem if e.prefix == null => e.copy(prefix = prefix)
    }(node)
  }


val modified = setNamespace(<a><b/><c:c/></a>, "fo", "uri:fons")
Assert.assertEquals(<fo:a xmlns:fo="uri:fons"><fo:b/><c:c/></fo:a>, modified)