 | | | Fomatting question serializing DOM with pretty-print | Fomatting question serializing DOM with pretty-print 2007-02-20 - By Dick Deneer
Brian,
Thanks for the explanation.
As already commented in the example test code, it is possible to filter out
whitespace in the calling program.
To workaround the issue with the indent (newline) of the root may be more
complicated.
I hope that in the future the xalan parser will bring full backwards
compatibility with the deprecated xerces one.
Dick Deneer
Brian Minchau wrote:
>
> Hi Dick,
> I ran the program that you point to with the URL and got your results.
>
> For this input:
> String xml = "<root>\n\n\n<child1>text</child1>
> <child2>text</child2></root>";
>
> For Xalan serializer and then Xerces serializer I get this:
>
> Program started
> Xalan serializer will be used
> <?xml version="1.0" encoding="UTF-16"?><root>
> <child1>text</child1>
> <child2>text</child2>
> </root>
>
>
> Program started
> Xerces serializer will be used
> <?xml version="1.0" encoding="UTF-16"?>
> <root>
> <child1>text</child1>
> <child2>text</child2>
> </root>
>
>
> The differences here are due to the fact that in the past the Xalan
> serializer has decided that the output XML file could be used as an
> external general parsed entity and included in yet another XML file. As
> such we don't know where it will be included and the extra newline that
> Xerces inserts after the XML header may be included next to non-whitespace
> text and become part of that text node. Added indentation or not, extra
> whitespace before the document element is not always correct, so Xalan
> doesn't do it.
>
> I looked at the code recently and saw that the DOM3 save support does
> indeed choose to indent 3 spaces per indentation level, and this code was
> contributed by to Xalan by people on the Xerces team, so I don't know why
> Xerces indents by 4 spaces. This difference is not important, there is no
> "right" way to do indentation, it depends on implementation.
>
>
>
> Then to add some whitespace, for this input:
> String xml = "<root>\n\n\n<child1>text</child1>
> <child2>text</child2></root>";
>
> Program started
> Xalan serializer will be used
> <?xml version="1.0" encoding="UTF-16"?><root>
>
>
> <child1>text</child1> <child2>text</child2>
> </root>
>
>
>
>
> Program started
> Xerces serializer will be used
> <?xml version="1.0" encoding="UTF-16"?>
> <root>
> <child1>text</child1>
> <child2>text</child2>
> </root>
>
>
> Again Xalan does not inject any whitespace between the xml header and the
> document element, for the same reasons as given before. I'm not sure
> about
> the other whitespace differences. It looks like Xalan has decided that it
> won't add whitespace to existing whitespace and effectively does no
> indentation. Xerces serializer however rips out the whitespace from the
> document being serialized and replaces it with nicer looking whitespace.
> I'm not sure if that is OK to do that, perhaps someone from Xerces will
> comment on the differences.
> (Michael?)
>
>
> - Brian
> - - - - - - - - - - - - - - - - - - - -
> Brian Minchau, Ph.D.
> XSLT Development, IBM Toronto
> e-mail: minchau@(protected)
>
>
>
>
> Dick Deneer
> <dick.deneer@(protected)
> eydevelopment.com To
> > xalan-j-users@(protected)
> cc
> 02/19/2007 07:40
> AM Subject
> Fomatting question serializing DOM
> with pretty-print
>
>
>
>
>
>
>
>
>
>
>
> I build a DOM with the following xml :
> <root><child1>text</child1><child2>text</child2></root>
> After serializing using the xalan serializer with the pretty-print option
> I
> get:
> <?xml version="1.0" encoding="UTF-16"?><root>
> <child1>text</child1>
> <child2>text</child2>
> </root>
>
> So the opening of the root is also in the first line.
>
> Second when I put in carriage returns or spaces, this effects the
> formatting
> seriously.
> For instance when I build a DOM with:
> <root>\n\n\n<child1>text</child1> <child2>text</child2></root>
> After serializing I get:
> <?xml version="1.0" encoding="UTF-16"?><root>
>
>
> <child1>text</child1> <child2>text</child2>
> </root>
>
> In all the cases the xerces serializer returns:
> <?xml version="1.0" encoding="UTF-16"?>
> <root>
> <child1>text</child1>
> <child2>text</child2>
> </root>
>
> Can you tell me if this behaviour i right?
> http://www.nabble.com/file/6633/TestSerializer.java TestSerializer.java
> --
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-tf3252607.html#a9041632
>
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>
>
>
>
>
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-serializing-DOM-with-pretty-print-tf3252607.html#a9067789
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