[xml] xmllint reporting that a schema is empty

[Stefan Kost <kost imn htwk-leipzig de>]

hi hi,

I am using libxml2-2.5.7 on solaris-2.6 (the recent version 2.5.8 fails to build
on my system) and doing my first steps with xml-schemas. Here is my setup in detail:
> xmllint --version
xmllint: using libxml version 20507
   compiled with: FTP HTTP HTML C14N Catalog DocBook XPath XPointer XInclude
Iconv Unicode Regexps Automata Schemas

And here is what I am doing (see files attached):

> xmllint --relaxng lightscene.xsd lightscene-example.xml
xmlRelaxNGParse: ./lightscene.xsd is empty
Relax-NG schema ./lightscene.xsd failed to compile
<?xml version="1.0"?>
<lightscene>
 <scene/>
</lightscene>

For me this is surprising as the schema is not empty. Can anybody enlighten me,
why libxml2 is thinkig is it.

Many thanks
  Stefan Kost
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<?xml version="1.0" ?>

<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema";>
        <xsd:element name="lightscene">
                <xsd:complexType>
                        <xsd:sequence>
                                <xsd:element name="scene" type="xsd:string"/>
                        </xsd:sequence>
                </xsd:complexType>
        </xsd:element>
</xsd:schema>

<?xml version="1.0" ?>

<lightscene>
 <scene/>
</lightscene>