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From "Adam Lally (JIRA)" <uima-...@incubator.apache.org>
Subject [jira] Created: (UIMA-387) XMI Serializer can write invalid control characters
Date Tue, 01 May 2007 13:23:15 GMT
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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