This documentation provides detailed information about Enesys SharePoint Query syntax.
In most cases, you will not have to deal with the query language directly but will rather use the visual Query Designer.
Enesys SharePoint Query Designer
Enesys SharePoint Query language syntax is based on XML. The syntax is simple and straightforward. However, we are providing a Visual Query Designer that makes it unnecessary to deal with the details of the syntax.
This documentation explains how to use the Visual Query Designer.