The following comment has been added to this issue:
Author: Henry Zongaro
Created: Mon, 20 Sep 2004 12:15 PM
Body:
This behaviour may be surprising, but it's required by JAXP. From the description of
Result.PI_DISABLE_OUTPUT_ESCAPING [1]:
The name of the processing instruction that is sent if the result
tree disables output escaping.
Normally, result tree serialization escapes & and < (and possibly
other characters) when outputting text nodes. This ensures that the
output is well-formed XML. However, it is sometimes convenient to
be able to produce output that is almost, but not quite well-formed
XML; for example, the output may include ill-formed sections that
will be transformed into well-formed XML by a subsequent non-XML
aware process. If a processing instruction is sent with this name,
serialization should be output without any escaping.
Result DOM trees may also have PI_DISABLE_OUTPUT_ESCAPING and
PI_ENABLE_OUTPUT_ESCAPING inserted into the tree.
JAXP uses this mechanism as a way of indicating the presence of text for which output
escaping is intended to be disabled in DOM and SAX. In this way, subsequent
redirection of the DOM tree or SAX events to a StreamResult will exhibit the expected
behaviour.
Introducing an option to disable this feature might be desirable, but by default the
processor must emit these processing instructions as there might be TCK tests that
test for this behaviour. I don't know whether there actually are. I will change this
bug report to an enhancement request.
Given that code that relied on such an option would not be portable, it might be
better for a user to use a portable solution that is not very difficult to code:
viz., filtering out these processing instructions "manually".
[1]
http://xml.apache.org/xalan-j/apidocs/javax/xml/transform/Result.html#PI_DISABLE_OUTPUT_ESCAPING
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View the issue:
http://issues.apache.org/jira/browse/XALANJ-1945
Here is an overview of the issue:
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Key: XALANJ-1945
Summary: Xalan inserts unasked for processing instructions in output for doe
Type: Bug
Status: Unassigned
Priority: Major
Project: XalanJ2
Components:
Xalan
Versions:
2.6
Assignee:
Reporter: elharo
Created: Sun, 19 Sep 2004 6:49 AM
Updated: Mon, 20 Sep 2004 12:15 PM
Description:
In some circumstances Xalan adds javax.xml.transform.disable-output-escaping and
javax.xml.transform.enable-output-escaping processing instructions to the result tree.
This is incorrect. There's nothing in my stylesheet that indicates this should happen.
If it's an option, it should be turned off by default, and if it is done it should be
done at serialization only, not when the result tree is constructed through a
SAXResult.
See
http://www.google.com/search?q=javax.xml.transform.disable-output-escaping&sourceid=mozilla&start=0&start=0&ie=utf-8&oe=utf-8
to note that I'm not the only person this has surprised or caused problems for.
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