XSD/XML Schemas: resolving `Namespace ” is not available to be referenced in this schema` (via: StackOverflow)
Posted by jpluimers on 2013/09/01
While working on my Delphi: First try on an XSD for .groupproj files, I bumped into an error `Namespace ” is not available to be referenced in this schema`.
I added a targetNamespace attribute to the GroupProj.xsd so the .grouproj files would use the right namespace.
That resulted into two funny errors:
- Namespace ” is not available to be referenced in this schema.
Visual Studio (which I normally use for editing XSD) would only throw this error on these elements:
<xsd:element ...>
So it would not throw them on nodes using the empty namespace.
That was really confusing! - When validating .grouproj files using this GroupProj.xsd, I would get this error for all .groupproj files:
System.Xml.Schema.XmlSchemaValidationException: Type ‘<type>’ is not declared. (in this case for ‘<type>’ ‘ProjectType’).
That was odd too: the ‘ProjectType’ was indeed declared, and should be valid.
I could hardly find any information about the latter error, but the former gave a few useful hits.
Thanks User weston – Stack Overflow. for answering this: it made me smack to my head (like usual, a case of EBCAK).
To resolve Namespace ” is not available to be referenced in this schema. You can set the default ” namespace without the need to change the rest of the file:
So after adding the below default xmlns to the XSD, not only the first, but also the second error were gone!
xmlns="http://schemas.microsoft.com/developer/msbuild/2003"
This is the work in progress on GroupProj.xsd:
–jeroen
via: How do I use inheritance (ie xs:extension) in my own xml schema? – Stack Overflow.
uligerhardt said
s/through/throw/ please. :-)
jpluimers said
Thanks: fixed. I was pretty tired writing that (: