title: using xsd.exe to generate c# files, getting error and warnings
body: <p>This is the command i'm running:</p>
  
  <pre><code>xsd.exe -c -l:c# D:\Documents\DEV\SARPilot\Docs\schemas\06-141r2\06-141r2.xsd
  </code></pre>
  
  <p>These are the errors i'm getting:</p>
  
  <pre><code>Microsoft (R) Xml Schemas/DataTypes support utility
  [Microsoft (R) .NET Framework, Version 2.0.50727.3038]
  Copyright (C) Microsoft Corporation. All rights reserved.
  Schema validation warning: Undefined complexType 'http://www.opengis.net/sps/0:ParameterDescriptorType' is used as a base for comp
  lex type extension. Line 617, position 2.
  Schema validation warning: Undefined complexType 'http://www.opengis.net/ows:GetCapabilitiesType' is used as a base for complex ty
  pe extension. Line 23, position 2.
  Schema validation warning: Undefined complexType 'http://www.opengis.net/ows:CapabilitiesBaseType' is used as a base for complex t
  ype extension. Line 35, position 2.
  Schema validation warning: The 'http://www.opengis.net/gml:Point' element is not declared. Line 869, position 2.
  Schema validation warning: The 'http://www.opengis.net/gml:Polygon' element is not declared. Line 870, position 2.
  Schema validation warning: The 'http://www.opengis.net/gml:Rectangle' element is not declared. Line 871, position 2.
  Schema validation warning: The 'http://www.opengis.net/sps/0:Parameter' element is not declared. Line 381, position 2.
  Schema validation warning: The 'http://www.opengis.net/sps/0:ID' element is not declared. Line 451, position 2.
  
  Warning: Schema could not be validated. Class generation may fail or may produce incorrect results.
  
  Error: Error generating classes for schema 'D:\Documents\DEV\SARPilot\Docs\schemas\06-141r2\06-141r2'.
    - The datatype 'http://www.opengis.net/ows:GetCapabilitiesType' is missing.
  
  If you would like more help, please type "xsd /?".
  
  C:\Program Files (x86)\Microsoft SDKs\Windows\v7.0A\Bin&gt;
  </code></pre>
  
  <p>The XSD file was copy/pasted from Appendix A in the following document:
  <a href="http://services.eoportal.org/portal/documents/06-141r2_Ordering_Services_for_Earth_Observation_Products_0.9.2.pdf" rel="noreferrer">http://services.eoportal.org/portal/documents/06-141r2_Ordering_Services_for_Earth_Observation_Products_0.9.2.pdf</a></p>