Re: [xml] referencing to parameter entity

[Daniel Veillard <veillard redhat com>]

On Sat, Apr 03, 2004 at 02:02:48PM +0200, Furucz Janos wrote:
[...]
> I need to create a doc that starts like this:
> <?xml version="1.0"?>
> <!DOCTYPE IDMEF-Message PUBLIC "-//IETF//DTD RFC XXXX IDMEF v1.0//EN"
> "/usr/local/share/snort/idmef-message.dtd" [
> <!ENTITY % x-fwmessage SYSTEM "/usr/local/share/snort/fw-message.dtd">
> %x-fwmessage;
> ]>
> ...
> 
> I can add the external dtd to the doc as parameter entity with 
> xmlAddDocEntity(doc, FWDTD_NAME, XML_EXTERNAL_PARAMETER_ENTITY, NULL,
> FWDTD_PATH, NULL);
> function.
> 
> This function generates this doc:
> <?xml version="1.0"?>
> <!DOCTYPE IDMEF-Message PUBLIC "-//IETF//DTD RFC XXXX IDMEF v1.0//EN"
> "/usr/local/share/snort/idmef-message.dtd" [
> <!ENTITY % x-fwmessage SYSTEM "/usr/local/share/snort/fw-message.dtd">
> ]>
> ...
> 
> My question is, how can I create the "%x-fwmessage;" reference.
> Sorry about the question if it is trivial, but I'm new in xml.

  Hum, there is an hackish way to do this by adding a text node to the
DTD children of the document, based on xmlNewText() and xmlAddChild(),
here is a python based example:

>>> doc = libxml2.parseFile("tst.xml")
>>> print doc.serialize()
<?xml version="1.0"?>
<!DOCTYPE IDMEF-Message PUBLIC "-//IETF//DTD RFC XXXX IDMEF v1.0//EN" "/usr/local/share/snort/idmef-message.dtd" [
<!ENTITY % x-fwmessage SYSTEM "/usr/local/share/snort/fw-message.dtd">
]>
<IDMEF-Message/>
 
>>> dtd = doc.children
>>> text = libxml2.newText('%x-fwmessage;\n')
>>> dtd.addChild(text)
<xmlNode (text) object at 0x81f7fec>
>>> print doc.serialize()
<?xml version="1.0"?>
<!DOCTYPE IDMEF-Message PUBLIC "-//IETF//DTD RFC XXXX IDMEF v1.0//EN" "/usr/local/share/snort/idmef-message.dtd" [
<!ENTITY % x-fwmessage SYSTEM "/usr/local/share/snort/fw-message.dtd">
%x-fwmessage;
]>
<IDMEF-Message/>
 
>>>

Daniel

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