Here you find the XML-Schema for CmsSite.xml for latest AxCMS.net Versions:
The Schema files for other AxCMS.net versions are available upon request.
You can include a reference to the XML-Schema to your CmsSite.xml like this to enable Visual Studio schema validation (use the XSD-version appropriate for your AxCMS.net version):
<CmsSite version="5.0"
xmlns=""
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:noNamespaceSchemaLocation="http://axcms.net/upload/cmssite_definition_9_2_13363.xsd">