MarkLogic 12 EA 1 Product Documentation
cts:field-range-query-field-name

cts:field-range-query-field-name(
   $query as cts:field-range-query
) as xs:string*

Returns the fieldname used to construct the specified query.

Parameters
query	A query.

let $query := cts:field-range-query("aname",">","Jim Kurla")
return
cts:field-range-query-field-name($query)
  => aname

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MarkLogic 12 EA 1 Product Documentationcts:field-range-query-field-name