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From "Adam Lally (JIRA)" <uima-...@incubator.apache.org>
Subject [jira] Commented: (UIMA-387) XMI Serializer can write invalid control characters
Date Tue, 01 May 2007 21:34:15 GMT

    [ https://issues.apache.org/jira/browse/UIMA-387?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12492956
] 

Adam Lally commented on UIMA-387:
---------------------------------

There are several websites out there discouraging the use of XML 1.1.  For example: http://www.cafeconleche.org/books/effectivexml/chapters/03.html.
 I'm no XML expert but these make me wonder if switching to 1.1 will cause some application
to have difficulty using our XML output.  Perhaps, though, it's the least of the evils here.

EMF throws an exception during serialization, if you try to serialize a String containing
an invalid XML character.  There's an option you can set to tell it to serialize to XML 1.1,
in which case it will properly escape the character and won't throw an exception.  UIMA supports
that too,  you can do XMLSerializer.setOutputProperty(OutputKeys.VERSION, "1.1") to tell the
serializer to generate XML 1.1.  But there's no way to turn that on via a configuration parameter
to the XmiWriterCasConsumer or through GUIs like the DocumentAnalyzer.  So one possibility
is just to expose that switch.

I think it is reasonable to disallow nulls.  Since we're using the XMI standard I don't think
we can get into defining our own special ways around the limitations of XML.  That would make
our XMI output not consumable by other systems such as EMF.

> XMI Serializer can write invalid control characters
> ---------------------------------------------------
>
>                 Key: UIMA-387
>                 URL: https://issues.apache.org/jira/browse/UIMA-387
>             Project: UIMA
>          Issue Type: Bug
>          Components: Core Java Framework
>    Affects Versions: 2.1
>            Reporter: Adam Lally
>             Fix For: 2.2
>
>
> On 5/1/07, Leo Ferres <lferres@ccs.carleton.ca> wrote:
> > Hello,
> >
> > While trying to open an xmi file after processing in xml view, an
> > error pops up telling me that there is an invalid &#26 xml character.
> > the error comes from the sax parser. Below is the stack trace. Thanks
> > very much for your help,
> >
> Most control characters are not allowed in XML 1.0, even if they are
> escaped with &#xxx.  If your input document contains such characters,
> the XMI CAS serializer is writing them to the output XMI document,
> making it unreadable.
> I checked that if you edit the XMI document and change the first line to:
> <?xml version="1.1" encoding="UTF-8"?>
> The problem goes away, because XML version 1.1 does allow escaped
> control characters.
> So one possibility for us to fix this in UIMA is to have the XMI CAS
> Serializer generate XML version 1.1 tag by default.  (I think we
> considered that before and decided not to for some reason, maybe we
> were worried that other applications might not be able to consume XML
> 1.1?  I can't remember. :)
> Another possibility would be to have the XMI serializer automatically
> replace these characters with spaces.  The XCAS (not XMI) serializer
> does that, but only for the document text, not for feature values.  We
> could also serialize the XMI using XML version 1.1, which allows
> escaped control characters (but still not the 0x00 character).

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