#1 Incorporating the CFA convention for aggregated datasets into CF

appa.adoc

@@ -9,7 +9,16 @@ See <<appendix-grid-mappings>> for the grid mapping attributes, and <<appendix-m
 The "Type" values are **S** for string, **N** for numeric, and **D** for the type of the data variable.
 Each attribute may be used in any of the ways shown in its "Use" entry.
 **G** indicates it can appear as a global attribute, and **Gr** as a group attribute.
-For variable attributes, the possible values of "Use" are: **C** for variables containing coordinate data, **D** for data variables, **M** for geometry container variables, **Do** for domain variables, **BI** and **BO** for boundary variables (see <<cell-boundaries>> for the distinction between **BI** and **BO**), and **-** for variables with some other purpose.
+For variable attributes, the possible values of "Use" are:
+
+* **C** for variables containing coordinate data,
+* **D** for data variables,
+* **M** for geometry container variables,
+* **Do** for domain variables,
+* **BI** and **BO** for boundary variables (see <<cell-boundaries>> for the distinction between **BI** and **BO**),
+* **A** for aggregation variables (see <<aggregation-variables>>),
+* **-** for variables with some other purpose.
+
 CF does not prohibit any of these attributes from being attached to variables of different kinds from those listed as their "Use" in this table, but their meanings are not defined by CF if they are used in these other ways.
 "Links" indicates the location of the attribute"s original definition (first link) and sections where the attribute is discussed in this document (additional links as necessary).
 
@@ -38,6 +47,18 @@ Attribute
 If both **`scale_factor`** and **`add_offset`** attributes are present, the data are first scaled before the offset is added.
 In cases where there is a strong constraint on dataset size, it is allowed to pack the coordinate variables (using add_offset and/or scale_factor), but this is not recommended in general.
 
+| **`aggregated_data`**
+| S
+| A
+| <<aggregation-variables>>
+| Records the aggregation instructions that define how to create the aggregated data of an aggregation variable.
+
+| **`aggregated_dimensions`**
+| S
+| A
+| <<aggregation-variables>>
+| Identifies the dimensions of the aggregated data of an aggregation variable.
+
 | **`ancillary_variables`**
 | S
 | D