Eclipse Community Forums: Modeling (top-level project) » XML namespaces in generated models

Help

Home

Home » Modeling » Modeling (top-level project) » XML namespaces in generated models

Show: Today's Messages :: Show Polls :: Message Navigator

XML namespaces in generated models [message #381897]

Wed, 02 April 2008 20:40

Eclipse User

Originally posted by: Robertson_Don.emc.com

I noticed that in generated XMI documents the root element is namespaced
with an explicit prefixed namespace declaration, but there is no default
namespace declaration and subordinate elements are not explicitly prefixed.

For example, "elements" below is not qualified (ecore and EMF from Ganymede
distribution) ...

<?xml version="1.0" encoding="UTF-8"?>
<rdb:Schema xmi:version="2.0" xmlns:xmi="http://www.omg.org/XMI"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:rdb="http://www.eclipse.org/qvt/1.0.0/Operational/examples/rdb">
<elements xsi:type="rdb:Table"/>
</rdb:Schema>

My understanding of XML is that the subordinate elements are not within a
namespace - containment only offers visibility to in-scope namespace
declarations, not implicit namespace assignment (except to an in-scope
default namespace).

Is this the intended behavior? If so, it complicates the use of XMI
documents in an XML repository (eg. with XQuery). And I can't see a point to
it.

Hopefully I am just plain wrong. If not, I know I can control serialization,
but as a default behavior this means the whole organization will have to do
so if we are to have EMF-generated documents co-resident in a repository.

Any comments?

Report message to a moderator

Re: XML namespaces in generated models [message #381898 is a reply to message #381897]

Wed, 02 April 2008 21:14

Ed Merks

Messages: 33141
Registered: July 2009

Senior Member

Don,

Thanks for preemptively posting to the EMF newsgroup.

Robertson, Don wrote:
> I noticed that in generated XMI documents the root element is namespaced
> with an explicit prefixed namespace declaration, but there is no default
> namespace declaration and subordinate elements are not explicitly prefixed.
>
> For example, "elements" below is not qualified (ecore and EMF from Ganymede
> distribution) ...
>
> <?xml version="1.0" encoding="UTF-8"?>
> <rdb:Schema xmi:version="2.0" xmlns:xmi="http://www.omg.org/XMI"
> xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
> xmlns:rdb="http://www.eclipse.org/qvt/1.0.0/Operational/examples/rdb">
> <elements xsi:type="rdb:Table"/>
> </rdb:Schema>
>
> My understanding of XML is that the subordinate elements are not within a
> namespace - containment only offers visibility to in-scope namespace
> declarations, not implicit namespace assignment (except to an in-scope
> default namespace).
>
> Is this the intended behavior? If so, it complicates the use of XMI
> documents in an XML repository (eg. with XQuery). And I can't see a point to
> it.
>
> Hopefully I am just plain wrong. If not, I know I can control serialization,
> but as a default behavior this means the whole organization will have to do
> so if we are to have EMF-generated documents co-resident in a repository.
>
> Any comments?
>
>

Ed Merks
Professional Support: https://www.macromodeling.com/

Report message to a moderator