Construct XML with dynamic label and attributes in Scala?

val myXml = <myTag/> % Attribute(None, "name", Text("value"), Null)

See scala.xml.Attribute for different constructors.

Adding the same attribute to all children:

scala> val xml = <root><a/><b/><c/></root>xml: scala.xml.Elem = <root><a></a><b></b><c></c></root>scala> xml.child map (_ match {     | case elem : Elem => elem % Attribute(None, "name", Text("value"), Null)     | case x => x     | })res3: Sequence[scala.xml.Node] = ArrayBuffer(<a name="value"></a>, <b name="value"></b>, <c name="value"></c>)

You can also use the stuff in scala.xml.transform to do so recursively to all XML:

val rr = new RewriteRule {  override def transform(n: Node): Seq[Node] = n match {    case elem : Elem => elem % Attribute(None, "name", Text("value"), Null) toSeq    case other => other  }}val rt = new RuleTransformer(rr)scala> rt(xml)res5: scala.xml.Node = <root name="value"><a name="value"></a><b name="value"></b><c name="value"></c></root>

Or you can add attributes to arbitrary parts of the xml:

scala> val xml = <root>{<a/> % Attribute(None, "name", Text("value"), Null)}</root>xml: scala.xml.Elem = <root><a name="value"></a></root>

EDIT

Changing the name is easy to do on Scala 2.8, like this:

val someTag = "tag"val myXml = <root>{<a/>.copy(label = someTag)}</root>

Note: you need to

import scala.xml.Null

to get this to work, and not scala.Null, which also exists.