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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 Thu, 03 May 2007 14:35:15 GMT

    [ https://issues.apache.org/jira/browse/UIMA-387?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12493384
] 

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

>"Can't" in what sense? What is preventing us? 

Sorry, I posted that too fast.  I was responding to Marshall's comment and not yours.  Of
course nothing prevents us except complying with the XMI specification, so if we don't want
to comply we could do whatever we want.

I suggest a two-prong solution here.  I think we should enable users to turn on XML 1.1 support,
to take care of everything but the 0 character, in a way that complies with standards.  

Then somebody can design and implement something nonstandard to handle the 0 character too.
 Personally I can't bring myself to care too much about supporting nulls, but if its the consensus
to do something about it I wouldn't block it.

> 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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