What contains a logical schema in an XQL query?

 A logical schema in an XQL query is a field, which is a named attribute of a dataset. A field can have a data type, such as string, integer, boolean, or array. A field can also have a modifier, such as bin or expand, that transforms the field value in the query output. A field can be used in the select, where, group by, order by, or having clauses of an XQL query. References:

XQL Syntax

XQL Data Types

XQL Field Modifiers