import java.io.File;
import java.io.FileInputStream;
import java.io.InputStreamReader;

import javax.xml.transform.Result;
import javax.xml.transform.Source;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.sax.SAXResult;
import javax.xml.transform.stream.StreamSource;

import org.apache.fop.apps.Driver;
import org.apache.fop.apps.Options;

public class Test {

	public static void main(String[] args) throws Exception  {
		Driver driver = new Driver();
//		Setup logging here: driver.setLogger(...
		driver.setRenderer(Driver.RENDER_PDF);

		Options options = new Options(new File("userconfig.xml"));
		
//		Setup the OutputStream for FOP
		driver.setOutputStream(new java.io.FileOutputStream("test.pdf"));

//		Make sure the XSL transformation's result is piped through to FOP
		Result res = new SAXResult(driver.getContentHandler());

//		Setup XML input
		Source src = new StreamSource(
				new InputStreamReader(new FileInputStream("test.xml"),"UTF8"));

//		Setup Transformer
		Source xsltSrc = new StreamSource("test.xsl");
		TransformerFactory transformerFactory = TransformerFactory.newInstance();
		Transformer transformer = transformerFactory.newTransformer(xsltSrc);

//		Start the transformation and rendering process
		transformer.transform(src, res);
	}
}

<fonts>
 <font metrics-file="arial.xml" kerning="yes" embed-file="arial.ttf">
    <font-triplet name="Arial" style="normal" weight="normal"/>
    <font-triplet name="ArialMT" style="normal" weight="normal"/>
 </font>
 <font metrics-file="arialbd.xml" kerning="yes" embed-file="arialbd.ttf">
    <font-triplet name="Arial" style="normal" weight="bold"/>
    <font-triplet name="ArialMT" style="normal" weight="bold"/>
 </font>
 <font metrics-file="ariali.xml" kerning="yes" embed-file="ariali.ttf">
    <font-triplet name="Arial" style="italic" weight="normal"/>
    <font-triplet name="ArialMT" style="italic" weight="normal"/>
 </font>
 <font metrics-file="arialbi.xml" kerning="yes" embed-file="arialbi.ttf">
    <font-triplet name="Arial" style="italic" weight="bold"/>
    <font-triplet name="ArialMT" style="italic" weight="bold"/>
 </font>
 </fonts>