Range Subsetting: Improvements and addressing #162

- Issue #162: Additional requirement component regarding field order
- Using 'fields' rather than 'bands' as it is a more general term
- Clearer separate requirement regarding RangeType
- Simplified redundant text

standard/clause_8_3_range-subset.adoc

@@ -1,10 +1,11 @@
 [[rc-range-subset-section]]
 == Requirements Class Range Subset
 
-The Range Subset Requirements Class defines the `properties` parameter for selecting a subset of the DataRecord fields (defined in the Range Type, e.g. individual imagery bands) to retrieve from Range Sets.
-
-The `Range Subset` Requirements Class defines the application of the `properties` parameter against the RangeSet component of a Coverage resource using the HTTP GET operation.
-The effect is to generate a subset of the range set of the coverage. That subset is then returned to the client in the HTTP response.
+The Range Subset Requirements Class defines the `properties` parameter for selecting a subset of the DataRecord fields (defined in the Range Type, e.g. individual imagery bands)
+to retrieve from Range Sets, either of a Coverage resource, or a separate RangeSet resource of the coverage, using the HTTP GET operation.
+The effect is to generate a subset of the range set of the coverage. The order of the fields as listed in the value of the parameter also determines the order
+in which those fields will be ordered in the response, if the negotiated format has such a concept of field order.
+That subset is then returned to the client in the HTTP response.
 
 This query parameter affects both the `/collections/{collection_id}/coverage` and `/collections/{collection_id}/coverage/rangeset` resource paths.
 

standard/requirements/coverage-rangesubset/REQ_cov-rangesubset-success.adoc

@@ -2,8 +2,9 @@
 [width="90%",cols="2,6a"]
 |===
 ^|*Requirement {counter:req-id}* |*/req/coverage-rangesubset/success*
-^|A |The `range-subset` parameter SHALL be applied to the coverage (and rangeset, if available as a separate resource).
-^|B |Only the bands of the coverage addressed SHALL be returned that correspond to one of the bands selected by the range subset expression
-whereby a `*` (asterisk) at the begining or at the end of the comma-separated list denotes all other bands before or after the listed bands, respectively.
-The RangeType shall be adjusted accordingly to the new selected bands.
+^|A |The `properties` parameter SHALL be applied to the coverage (and rangeset, if available as a separate resource).
+^|B |Only the fields of the coverage addressed SHALL be returned that correspond to one of the fields selected by the range subset expression
+whereby a `*` (asterisk) at the begining or at the end of the comma-separated list denotes all other fields before or after the listed fields, respectively.
+^|C |The RangeType describing the fields of the coverage being returned SHALL be adjusted accordingly to the new selected fields.
+^|D |If the negotiated format of the response has a concept of field order, then the fields SHALL be in the same order as the list of selected fields.
 |===