Problem using default xml namespace and selectsignlenode/selectnod

[rrm]

Hi

I am verifying a SLD implementation using xml, however I have som problem
using xpath and default namespaces in vb.net

Currently I have the following xml
<?xml version="1.0"?>
<StyledLayerDes criptor version="1.0.0"
xsi:schemaLocat ion="http://www.opengis.net/sld
http://schemas.opengis .net/sld/1.0.0/StyledLayerDesc riptor.xsd"
xmlns:sld="http ://www.opengis.net/sld" xmlns:ogc="http ://www.opengis.net/ogc"
xmlns:xlink="ht tp://www.w3.org/1999/xlink"
xmlns:xsi="http ://www.w3.org/2001/XMLSchema-instance">
<Name>TestNam e</Name>
<Title>TestTitl e</Title>
<Abstract>TestA bstract</Abstract>
</StyledLayerDesc riptor>

and the following code to read it:
Dim writer As Xml.XmlTextWrit er = New Xml.XmlTextWrit er(file, Nothing)
doc.Load(file)
where file is the location of the xml and doc is a xmldocument objekt

I ask with:
Dim r As Xml.XmlNode = doc.SelectSingl eNode("/StyledLayerDesc riptor/Name")
Console.WriteLi ne("Name " & r.InnerXml)

The return value is nothing, any clue of why??? If I dont use default
namespace, then it can be found.

rrm

[Martin Honnen]

Re: Problem using default xml namespace and selectsignlenod e/selectnod



rrm wrote:

Dim r As Xml.XmlNode = doc.SelectSingl eNode("/StyledLayerDesc riptor/Name")

The return value is nothing, any clue of why??? If I dont use default
namespace, then it can be found.

You need a namespace manager e.g.
Dim namespaceManage r As XmlNamespaceMan ager =_
new XmlNamespaceMan ager(doc.NameTa ble)
namespaceManage r.AddNamespace( "pf", "default namespace URI here")
then e.g.
doc.SelectSingl eNode("/pf:StyledLayerD escriptor/pf:Name",_
namespaceManage r)

--

Martin Honnen --- MVP XML

http://JavaScript.FAQTs.com/

[rrm]

Re: Problem using default xml namespace and selectsignlenod e/selec


Hi

You need a namespace manager e.g.
Dim namespaceManage r As XmlNamespaceMan ager =_
new XmlNamespaceMan ager(doc.NameTa ble)
namespaceManage r.AddNamespace( "pf", "default namespace URI here")
then e.g.
doc.SelectSingl eNode("/pf:StyledLayerD escriptor/pf:Name",_
namespaceManage r)

ok

I found an error in my posting: xmlns:sld=... should be xmlns=...
<StyledLayerDes criptor version="1.0.0"
xsi:schemaLocat ion="http://www.opengis.net/sld
http://schemas.opengis .net/sld/1.0.0/StyledLayerDesc riptor.xsd"
xmlns="http://www.opengis.net/sld" xmlns:ogc="http ://www.opengis.net/ogc"
xmlns:xlink="ht tp://www.w3.org/1999/xlink"
xmlns:xsi="http ://www.w3.org/2001/XMLSchema-instance">

Would that help me to avoid using namespace "ns:" in selectsinglenod e???

Are there any different in the way dotnet 1 and dotnet 2 handles this??

[Martin Honnen]

Re: Problem using default xml namespace and selectsignlenod e/selec



rrm wrote:

I found an error in my posting: xmlns:sld=... should be xmlns=...

Would that help me to avoid using namespace "ns:" in selectsinglenod e???

You need to use a namespace manager if you want to select elements or
attributes in a namespace. An XPath (1.0) expression in the form of e.g.
element-name
only selects elements of that name in _no_ namespace. If your elements
are in a namespace then you need a namespace manager that binds a prefix
to the namespace URI and then you need to use that prefix in the XPath
expression e.g.
pf:element-name

See also "Namespaces in XPath Expressions" in
<http://msdn2.microsoft .com/en-us/library/d271ytdx.aspx>


--

Martin Honnen --- MVP XML

http://JavaScript.FAQTs.com/