.union(parentAncestorsStrictVersionConstraints)
                    .union(parentEndorsedStrictVersionConstraints);
            } else {
                constraints = constraints.intersect(
                    parentStrictVersionConstraints
                        .union(parentAncestorsStrictVersionConstraints)
                        .union(parentEndorsedStrictVersionConstraints)
                );

  //   - 'map': `X + Y` performs a merge where the array positions of all keys in `X` are preserved but the values
  //     are overwritten by values in `Y` when the key sets of `X` and `Y` intersect. Elements in `Y` with
  //     non-intersecting keys are appended, retaining their partial order.
  // Required.
  optional string Expression = 1;

  //   - 'map': `X + Y` performs a merge where the array positions of all keys in `X` are preserved but the values
  //     are overwritten by values in `Y` when the key sets of `X` and `Y` intersect. Elements in `Y` with
  //     non-intersecting keys are appended, retaining their partial order.
  //
  // If `rule` makes use of the `oldSelf` variable it is implicitly a
  // `transition rule`.
  //

  //   - 'map': `X + Y` performs a merge where the array positions of all keys in `X` are preserved but the values
  //     are overwritten by values in `Y` when the key sets of `X` and `Y` intersect. Elements in `Y` with
  //     non-intersecting keys are appended, retaining their partial order.
  //
  // If `rule` makes use of the `oldSelf` variable it is implicitly a
  // `transition rule`.
  //

  //   - 'map': `X + Y` performs a merge where the array positions of all keys in `X` are preserved but the values
  //     are overwritten by values in `Y` when the key sets of `X` and `Y` intersect. Elements in `Y` with
  //     non-intersecting keys are appended, retaining their partial order.
  // Required.
  optional string Expression = 1;

	"message":           "Message represents the message displayed when validation fails. The message is required if the Expression contains...

  //   - 'map': `X + Y` performs a merge where the array positions of all keys in `X` are preserved but the values
  //     are overwritten by values in `Y` when the key sets of `X` and `Y` intersect. Elements in `Y` with
  //     non-intersecting keys are appended, retaining their partial order.
  // Required.
  optional string Expression = 1;

	"message":           "Message represents the message displayed when validation fails. The message is required if the Expression contains...

	//   - 'map': `X + Y` performs a merge where the array positions of all keys in `X` are preserved but the values
	//     are overwritten by values in `Y` when the key sets of `X` and `Y` intersect. Elements in `Y` with
	//     non-intersecting keys are appended, retaining their partial order.
	// Required.
	Expression string

	//   - 'map': `X + Y` performs a merge where the array positions of all keys in `X` are preserved but the values
	//     are overwritten by values in `Y` when the key sets of `X` and `Y` intersect. Elements in `Y` with
	//     non-intersecting keys are appended, retaining their partial order.
	// Required.
	Expression string `json:"expression" protobuf:"bytes,1,opt,name=Expression"`