[xsd-users] Re: Adding namspaces

[Boris Kolpackov]

Hi Matt,

Matt Burnham <mwburn at mhpcc.hpc.mil> writes:

>    I have one last issue that I need to fix ASAP.  I need to create an
>    in-memory tree and then serialize it to XML.
>
>    I have it all working except for the "detail" section.  When I parse this
>    section, I use the keep-dom flag, and then load the various sub-schema's
>    using the xerces DOMElement's.  So I'm not sure how to "create" the tree
>    on the fly.  I'm assuming I need to create new DOMElements and populate
>    them, but can't seem to get it working.

The easiest way to achieve this is to (1) serialize event and embedded_data
into two separate DOM documents, then (2) move the embedded_data sub-tree
to the event document, and finally (3) write the resulting DOM document
to XML. The code for these operations will look something like this:

(1):

using namespace xerces-c
namespace xml = xsd:cxx::xml;
namespace dom = xml::dom;

event_type& e = ...
embedded_data_type& ed = ...

dom::auto_ptr<DOMDocument> event_doc (event (e));
dom::auto_ptr<DOMDocument> ed_doc (detail (ed));


(2):

DOMElement* ed_el (ed_doc->getDocumentElement ()); // 'embedded_data' element
event_doc->adoptNode (ed_el); // ed_el not belongs to event_doc

// Now we need to insert the embedded_data element (ed_el) in the right
// place in the event document.
//

DOMElement* event_el (event_doc->getDocumentElement ()) // 'event' element

DOMNodeList* nl (event_el->getElementsByTagName("detail"));
DOMElement* detail_el (static_cast<DOMElement*> (nl->item (0)));

detail_el->appendChild (ed_el); // insert 'embedded_data' element


(3):

// See Xerces-C++ examples for more information.
//

DOMImplementation* impl (
  DOMImplementationRegistry::getDOMImplementation (
    xml::string ("LS").c_str ()));

dom::auto_ptr<DOMWriter> writer (impl->createDOMWriter ());

if (writer->canSetFeature (XMLUni::fgDOMWRTDiscardDefaultContent, true))
  writer->setFeature (XMLUni::fgDOMWRTDiscardDefaultContent, true);

if (writer->canSetFeature (XMLUni::fgDOMWRTFormatPrettyPrint, true))
  writer->setFeature (XMLUni::fgDOMWRTFormatPrettyPrint, true);


LocalFileFormatTarget ft ("out.xml");

writer->writeNode (&ft, *event_doc);


hth,
-boris
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