trouble using FOP to process FO file generated by Xalan or Saxon

I was using xsltproc as my XSLT processor, but it ran out of memory on a large book, so I decided to try Xalan and Saxon to convert a test book. I set up Xalan and Saxon according to the instructions in Bob Stayton’s book, DocBook XSL: The Definitive Guide (http://www.sagehill.net/docbookxsl/index.html). However, when I try to use FOP 0.93 to convert either of the attached FO files, it reports the following exception:

org.xml.sax.SAXParseException: Content is not allowed in prolog.

I pasted full output of the exception below.

Has anyone else experienced this problem? Please take a look at the attached FO files and tell me what’s wrong.

Regards,

Jeff Powanda

[Fatal Error] :1:1: Content is not allowed in prolog.

Jun 9, 2007 5:21:38 PM org.apache.fop.image.analyser.XMLReader createDocument

WARNING: Error while constructing image from XML

org.xml.sax.SAXParseException: Content is not allowed in prolog.

at org.apache.xerces.parsers.DOMParser.parse(Unknown Source)

at org.apache.xerces.jaxp.DocumentBuilderImpl.parse(Unknown Source)

at javax.xml.parsers.DocumentBuilder.parse(DocumentBuilder.java:98)

at org.apache.fop.image.analyser.XMLReader.createDocument(XMLReader.java:115)

at org.apache.fop.image.analyser.XMLReader.loadImage(XMLReader.java:95)

at org.apache.fop.image.analyser.XMLReader.verifySignature(XMLReader.java:65)

at org.apache.fop.image.analyser.ImageReaderFactory.make(ImageReaderFactory.java:85)

at org.apache.fop.image.ImageFactory.loadImage(ImageFactory.java:220)

at org.apache.fop.image.ImageLoader.loadImage(ImageLoader.java:56)

at org.apache.fop.image.ContextImageCache.getImage(ImageFactory.java:432)

at org.apache.fop.image.ImageFactory.getImage(ImageFactory.java:157)

at org.apache.fop.fo.flow.ExternalGraphic.bind(ExternalGraphic.java:68)

at org.apache.fop.fo.FObj.processNode(FObj.java:118)

at org.apache.fop.fo.FOTreeBuilder$MainFOHandler.startElement(FOTreeBuilder.java:321)

at org.apache.fop.fo.FOTreeBuilder.startElement(FOTreeBuilder.java:185)

at org.apache.xalan.transformer.TransformerIdentityImpl.startElement(TransformerIdentityImpl.java:1072)

at org.apache.xerces.parsers.AbstractSAXParser.startElement(Unknown Source)

at org.apache.xerces.parsers.AbstractXMLDocumentParser.emptyElement(Unknown Source)

at org.apache.xerces.impl.XMLNSDocumentScannerImpl.scanStartElement(Unknown Source)

at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source)

at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)

at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)

at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)

at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)

at org.apache.xalan.transformer.TransformerIdentityImpl.transform(TransformerIdentityImpl.java:484)

at org.apache.fop.cli.InputHandler.transformTo(InputHandler.java:165)

at org.apache.fop.cli.InputHandler.renderTo(InputHandler.java:115)

at org.apache.fop.cli.Main.startFOP(Main.java:160)

at org.apache.fop.cli.Main.main(Main.java:191)

Jun 9, 2007 5:21:38 PM org.apache.fop.image.ImageFactory loadImage

SEVERE: Error while recovering image information () : null

java.lang.NullPointerException

at org.apache.fop.image.analyser.XMLReader.verifySignature(XMLReader.java:66)