Use ContextData annotation.

Default Data Scope Order:
  1. SCOPE_ATTR
  2. SCOPE_PATHVAR
  3. SCOPE_QUERYPARAM
  4. SCOPE_FLASH
  5. SCOPE_COOKIE
  6. SCOPE_HEADER
  7. SCOPE_REQUEST
  8. SCOPE_SESSION
  9. SCOPE_GLOBAL
This order can be customize to use below method.
com.astamuse.asta4d.data.DefaultContextDataFinder#setDataSearchScopeOrder()
User @ContextData to change variable name.
changeName
User @ContextData to specific query scope.
specificScope