-For variant tag definition only, the dynamic scope used to look up the
-location of the associated tag field consists in the lexical scope of
-the structures where the variant is declared, extended with the implicit
-dynamic scope specified by the event structure hierarchy presented at
-the beginning of Section 6. Therefore, lower levels in the dynamic scope
-(e.g. event context) can refer to a tag field located in upper levels
-(e.g. in the event header) by specifying, in this case,
-"header.field_name" as tag identifier. This allows, for instance, the
-event context to define a variant referring to the "id" field of the
-event header as selector.
+A dynamic scope consists in the lexical scope augmented with the
+implicit event structure definition hierarchy presented at Section 6.
+The dynamic scope is only used for variant tag definitions. It is used
+at definition time to look up the location of the tag field associated
+with a variant.
+
+Therefore, variants in lower levels in the dynamic scope (e.g. event
+context) can refer to a tag field located in upper levels (e.g. in the
+event header) by specifying, in this case, the associated tag with
+<header.field_name>. This allows, for instance, the event context to
+define a variant referring to the "id" field of the event header as
+selector.