Re: [docbook] DocBook SGML article and titlepage, + remove header

["Bob Stayton" <bobs@sagehill.net>]

Hi Lars,
First, make sure that the DocBook document that you are processing validates.  The 
XSLT process does not validate before generating output, and an invalid document can 
produce invalid XSL-FO output that FOP cannot handle.  A NullPointerException often 
indicates a malformed XSL-FO file.

Second, the message about "adding namespace" indicates that you are processing a 
DocBook 4 document with the version of the stylesheets that are written for DocBook 5, 
which uses the docbook namespace.  If you are processing DocBook 4 documents, I would 
suggest you instead use the non-namespaced version of the stylesheets.  On the 
SourceForge site:

docbook-xsl  = non-namespaced stylesheets for DocBook 4.
docbook-xsl-ns = namespaced stylesheets for DocBook 5.

Either one will generally work, but using the right version will be a bit faster as it 
does not have to convert, and it reduces potential problems downstream.

Bob Stayton
Sagehill Enterprises
bobs@sagehill.net


----- Original Message ----- 
From: "Lars "Bjørndal"" <lars@lamasti.net>
To: <docbook@lists.oasis-open.org>
Sent: Sunday, September 04, 2011 11:56 PM
Subject: Re: [docbook] DocBook SGML article and titlepage, + remove header


"Mauritz Jeanson" writes:

> |  -----Original Message-----
> |  From: Lars "Bjørndal"
> |
> |  Well, I've read this article:
> |  <http://www.redhat.com/magazine/016feb06/features/docbook_xml/>
> |
> |  Here, it's recommended to use xmlto to convert documents to several
> |  formats. About PDF output, however, the following is stated:
> |
> |    "Unfortunately, xmlto currently produces unattractive PDF
> |  files, but
> |    there are alternatives available. The docbook2* script
> |  wrappers may be
> |    useful in this regard. These helper scripts use openjade to convert
> |    DocBook source into other formats.
>
>
> IMHO, there are more modern tools than xmlto and openjade. I really think
> you should look into the DocBook XSL stylesheets.
>
> Start here: http://www.sagehill.net/docbookxsl/index.html

Thank you. According to information from the link you provided, I've
tried the following commands that gave some errors:

'xsltproc --output t.fo --stringparam double.side 1 --stringparam
fop1.extensions 1 --stringparam paper.type A4
/usr/share/sgml/docbook/xsl-ns-stylesheets/fo/docbook.xsl progoppsett-1.0.xml'

Note: namesp. add : added namespace before processing
Programvareop
psett for skjermleserbrukere
Making portrait pages on A4 paper (210mmx297mm)

Afterwards, doing: 'fop -fo t.fo -pdf t.pdf', I got some errors like
this:

05.sep.2011 08:49:06 org.apache.fop.fonts.FontInfo notifyFontReplacement
WARNING: Font 'Symbol,normal,700' not found. Substituting with 'Symbol,normal,400'.
05.sep.2011 08:49:06 org.apache.fop.fonts.FontInfo notifyFontReplacement
WARNING: Font 'ZapfDingbats,normal,700' not found. Substituting with 
'ZapfDingbats,normal,400'.
05.sep.2011 08:49:06 org.apache.fop.hyphenation.Hyphenator getHyphenationTree
SEVERE: Couldn't find hyphenation pattern nb
05.sep.2011 08:49:06 
org.apache.fop.layoutmgr.inline.LineLayoutManager$LineBreakingAlgorithm updateData2
WARNING: Line 1 of a paragraph overflows the available area by 2500mpt. (fo:block, 
location: 143/242)
05.sep.2011 08:49:06 org.apache.fop.cli.InputHandler error
SEVERE: javax.xml.transform.TransformerException
05.sep.2011 08:49:06 org.apache.fop.cli.Main startFOP
SEVERE: Exception
org.apache.fop.apps.FOPException: java.lang.NullPointerException
javax.xml.transform.TransformerException: java.lang.NullPointerException
at org.apache.fop.cli.InputHandler.transformTo(InputHandler.java:217)
at org.apache.fop.cli.InputHandler.renderTo(InputHandler.java:125)
at org.apache.fop.cli.Main.startFOP(Main.java:166)
at org.apache.fop.cli.Main.main(Main.java:196)
Caused by: javax.xml.transform.TransformerException: java.lang.NullPointerException
at 
com.sun.org.apache.xalan.internal.xsltc.trax.TransformerImpl.transform(TransformerImpl.java:720)
at 
com.sun.org.apache.xalan.internal.xsltc.trax.TransformerImpl.transform(TransformerImpl.java:317)
at org.apache.fop.cli.InputHandler.transformTo(InputHandler.java:214)
... 3 more
Caused by: java.lang.NullPointerException
at 
org.apache.fop.layoutmgr.inline.InlineStackingLayoutManager.applyChanges(InlineStackingLayoutManager.java:350)
at 
org.apache.fop.layoutmgr.inline.LineLayoutManager.findHyphenationPoints(LineLayoutManager.java:1480)
at 
org.apache.fop.layoutmgr.inline.LineLayoutManager.findOptimalBreakingPoints(LineLayoutManager.java:950)
at 
org.apache.fop.layoutmgr.inline.LineLayoutManager.createLineBreaks(LineLayoutManager.java:917)
at 
org.apache.fop.layoutmgr.inline.LineLayoutManager.getNextKnuthElements(LineLayoutManager.java:607)
at 
org.apache.fop.layoutmgr.BlockStackingLayoutManager.getNextKnuthElements(BlockStackingLayoutManager.java:294)
at 
org.apache.fop.layoutmgr.BlockLayoutManager.getNextKnuthElements(BlockLayoutManager.java:116)
at 
org.apache.fop.layoutmgr.BlockStackingLayoutManager.getNextKnuthElements(BlockStackingLayoutManager.java:294)
at 
org.apache.fop.layoutmgr.BlockLayoutManager.getNextKnuthElements(BlockLayoutManager.java:116)
at 
org.apache.fop.layoutmgr.BlockStackingLayoutManager.getNextKnuthElements(BlockStackingLayoutManager.java:294)
at 
org.apache.fop.layoutmgr.BlockLayoutManager.getNextKnuthElements(BlockLayoutManager.java:116)
at 
org.apache.fop.layoutmgr.FlowLayoutManager.getNextKnuthElements(FlowLayoutManager.java:107)
at org.apache.fop.layoutmgr.PageBreaker.getNextKnuthElements(PageBreaker.java:145)
at org.apache.fop.layoutmgr.AbstractBreaker.getNextBlockList(AbstractBreaker.java:552)
at org.apache.fop.layoutmgr.PageBreaker.getNextBlockList(PageBreaker.java:137)
at org.apache.fop.layoutmgr.AbstractBreaker.doLayout(AbstractBreaker.java:302)
at org.apache.fop.layoutmgr.AbstractBreaker.doLayout(AbstractBreaker.java:264)
at 
org.apache.fop.layoutmgr.PageSequenceLayoutManager.activateLayout(PageSequenceLayoutManager.java:106)
at org.apache.fop.area.AreaTreeHandler.endPageSequence(AreaTreeHandler.java:234)
at org.apache.fop.fo.pagination.PageSequence.endOfNode(PageSequence.java:123)
at org.apache.fop.fo.FOTreeBuilder$MainFOHandler.endElement(FOTreeBuilder.java:340)
at org.apache.fop.fo.FOTreeBuilder.endElement(FOTreeBuilder.java:169)
at 
com.sun.org.apache.xml.internal.serializer.ToXMLSAXHandler.endElement(ToXMLSAXHandler.java:265)
at 
com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.endElement(AbstractSAXParser.java:604)
at 
com.sun.org.apache.xerces.internal.xinclude.XIncludeHandler.endElement(XIncludeHandler.java:1017)
at 
com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanEndElement(XMLDocumentFragmentScannerImpl.java:1759)
at 
com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(XMLDocumentFragmentScannerImpl.java:2915)
at 
com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:625)
at 
com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.next(XMLNSDocumentScannerImpl.java:116)
at 
com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:488)
at 
com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:812)
at 
com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:741)
at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:123)
at 
com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1208)
at 
com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:525)
at 
com.sun.org.apache.xalan.internal.xsltc.trax.TransformerImpl.transformIdentity(TransformerImpl.java:640)
at 
com.sun.org.apache.xalan.internal.xsltc.trax.TransformerImpl.transform(TransformerImpl.java:711)
... 5 more

---------
...

Do I miss some packages? Any idea what I could do to solve this
problems?

Thanks,
Lars

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