XOM API for Processing XML with Java

["Galip Aydin" <gaydin AT grids.ucs.indiana.edu>]

Wolfgang,
Thanks for the reply. I am trying to serialize individual GML fragments 
which do not contain namespace declarations, as following;
<gml:featureMember>
<Entity>
 <Bus>
  <location>
   <gml:Point srsName="null">
    <gml:coord>
     <gml:X>-82.3773</gml:X>
     <gml:Y>28.0804</gml:Y>
     <gml:Z>1.0</gml:Z>
    </gml:coord>
   </gml:Point>
  </location>
 </Bus>
</Entity>
</gml:featureMember>

When I use the method described in the samples it gives an error about the 
namespace gml. So what is the best way to convert this XML fragment to bnux?
Thanks again,
Galip.


----- Original Message ----- 
From: "Wolfgang Hoschek" <wolfgang.hoschek AT mac.com>
To: "Galip Aydin" <gaydin AT grids.ucs.indiana.edu>
Cc: <xom-interest AT lists.ibiblio.org>
Sent: Tuesday, April 11, 2006 11:03 PM
Subject: Re: [XOM-interest] BNUX Question


> On Apr 11, 2006, at 7:49 PM, Galip Aydin wrote:
>
> > Hi All
> > I I am trying to use bnux in a GIS project to compress very large  GML 
> > documents. GML documents are XML files with geographic  information 
> > encoded according to OpenGIS standards. However because  of the current 
> > architecture I am having trouble using bnux, and I  was wondering if 
> > anybody has a suggestion. Here is the problem:
> > I am creating GML documents from MySQL ResultSets. There are  several 
> > namespace declaration at the top of the GML documents and  several 
> > hundred <gml:featureMember> elements. Each featureMember  element is 
> > created using an individual database results. The system  works as 
> > follows: I am retrieving the results from the MySQL  database in a 
> > streaming fashion, for each result creating a  featureMember element and 
> > publishing this to a publish/subscribe  messaging system topic. The 
> > client accumulates the results to  construct the whole GML document. 
> > However since each featureMember  element does not contain the namespace 
> > declarations I can't use bnux.
> > Now, is there a way to create a Streaming Serializer Factory by 
> > providing the namespaces once and use it to compress elements of  that 
> > document as they become available?
> >
> > Thanks in advance for any suggestions.
> > Galip.
>
> I'm not sure I understand the problem. On deserialization, bnux  recreates 
> whatever has been given to it before on serialization,  including 
> namespaces. There's no loss of information.
>
> It works by feeding normal XOM nodes such as elements into bnux. Each  XOM 
> element can have namespaces, but it need not. Such namespaces can  be 
> given in the Element constructor and via 
> Element.addNamespaceDeclaration(). In streaming fashion, you'll use a 
> StreamingSerializer obtained from 
> StreamingSerializerFactory.createBinaryXMLSerializer() to write bnux 
> format. There's an example in the javadoc for StreamingSerializer.
>
> BTW, you might want to get started with the bin/fire-bnux command  line 
> test tool, converting bnux to and from XML. You might also want  to run 
> the testsuite via "ant download-testdata test-bnux".
>
> Wolfgang.