Dan,
You have
<xsd:element name="manual_adapter" type="pentax:manual_adapter_type"/> in Camera.xsd
and
<manual_adapter>
<speed>1/10,000 sec to 100 sec</speed>
</manual_adapter> in Camera.xml
Now, if you would like to verify that <speed> element in Camera.xml still respects the schema Pentax.xsd, you need to add something like shown below in Pentax.xsd -
<xsd:complexType name="manual_adapter_type">
<xsd:sequence>
<xsd:element name="speed" type="xsd:string"/>
<xsd:element name="jaya" type="xsd:string"/>
</xsd:sequence>
</xsd:complexType>
The point here is that since you are referring to the pentax:manual_adapter_type in your Camera schema, you need to make changes to that complex type to see that the final xml document still respects the format laid out in the respective individual schema.
The above mentioned combination of xml
doc and schema would definitely produce an error by the schema validator