return pr, nil
}

func (c *Cmd) childStdout() (*os.File, error) {
	return c.writerDescriptor(c.Stdout)
}

func (c *Cmd) childStderr(childStdout *os.File) (*os.File, error) {
	if c.Stderr != nil && interfaceEqual(c.Stderr, c.Stdout) {
		return childStdout, nil
	}
	return c.writerDescriptor(c.Stderr)
}

// writerDescriptor returns an os.File to which the child process
// can write to send data to w.
//

        private final Model model;

        public ModelWriter(Model model) {
            this.model = model;
        }

        private void writeDescriptor(final Writer writer) throws IOException {
            OptionalAttributeXmlWriter xmlWriter = new OptionalAttributeXmlWriter(writer, "  ", IVY_FILE_ENCODING);