parser.scala

import org.xml.sax.InputSource
import xml.parsing.{NoBindingFactoryAdapter, FactoryAdapter}
import xml.factory.XMLLoader
import xml.Elem

object ResolvingXML extends XMLLoader[Elem] {
  override def adapter: FactoryAdapter = new NoBindingFactoryAdapter() {
    override def resolveEntity(publicId: String, systemId: String) : InputSource = {
     // use CatalogResolver here
    }
  }
}


// And use...

val xml = ResolvingXML.loadFile(...someplace...)