code: public boolean validateAgainstXsdFile(String xsdFileName) {
          String xsdContent = new FileFixture().textIn(xsdFileName);
          return new XMLValidator().validateAgainst(content, xsdContent);
      }
docs: Validate the loaded xml against a schema in file xsdFileName
  @param xsdFileName filename of the xsd to use
  @return true if the xml validates against the schema. Throws a descriptive exception otherwise