Tighten up the text

spec.md

@@ -186,32 +186,29 @@ within the same JSON object.
   - MUST be a non-empty string
 
 ### source
-* Type: `URI-reference`
-* Description: Identifies the event producer. Often this will include
+- Type: `URI-reference`
+- Description: Identifies the event producer. Often this will include
   information such as the type of the event source, the organization
-  publishing the event, the process that produced the event, and some
-  unique identifiers. The syntax of `source` is not defined by this
-  specification.
+  publishing the event, the process that produced the event, and some unique
+  identifiers. The exact syntax and semantics behind the data encoded in the URI
+  is event producer defined.
+
+  An application MUST assign a distinct `source` to each distinct producer.
+  The application MAY use UUIDs, URNs, DNS authorities or an application-specific
+  scheme to create unique identifiers.
 
-  In an application with many producers, each producer MUST be
-  assigned a distinct `source`. This specification does not define how
-  to ensure uniqueness. Since `source` is a URI-reference, it allows
-  for standard formats using DNS authorities or UUIDs, as well as
-  application-specific string or path identifiers.
-
-* Constraints:
-  * REQUIRED
-
-* Examples
-  * Internet-unique URI with a DNS authority.
-    * https://github.com/cloudevents/spec/pull/123
-    * mailto:cncf-wg-serverless@lists.cncf.io
-  * Universally-unique URN with a UUID:
-    *  urn:uuid:6e8bc430-9c3a-11d9-9669-0800200c9a66
-  * Application-specific path or string identifiers
-    * /cloudevents/spec/pull/123
-    * /sensors/tn-1234567/alerts
-    * 1-555-123-4567
+- Constraints:
+  - REQUIRED
+- Examples
+  - Internet-wide unique URI with a DNS authority.
+    - https://github.com/cloudevents/spec/pull/123
+    - mailto:cncf-wg-serverless@lists.cncf.io
+  - Universally-unique URN with a UUID:
+    -  urn:uuid:6e8bc430-9c3a-11d9-9669-0800200c9a66
+  - Application-specific identifiers
+    - /cloudevents/spec/pull/123
+    - /sensors/tn-1234567/alerts
+    - 1-555-123-4567
 
 ### subject
 - Type: `String`
@@ -242,22 +239,19 @@ within the same JSON object.
     - `subject`: mynewfile.jpg
 
 ### id
-* Type: `String`
-* Description: Identifies the event, enables de-duplication.  The
-  format of this string is determined by the producer. Each producer
-  MUST generate unique `id` values for its own events, `id` values
-  from different producers might clash. Consumers MAY assume that
-  events with identical `id` and `source` values are duplicates, and
-  MAY discard all but one of such duplicate events.
-* Examples:
-  * An event counter maintained by the producer
-  * A database commit ID
-* Constraints:
-  * REQUIRED
-  * MUST be a non-empty string
-  * The producer MUST provide a different `id` for each distinct event it produces.
-  * If a duplicate of a previous event is re-sent due to a failure, it
-    MAY have the same `id`.
+
+- Type: `String`
+- Description: Identifies the event for de-duplication.
+  Producers MUST ensure that each distinct event from the same `source` has a unique `id`  If a duplicate event is re-sent due to a network error, it MAY have the same `id`.
+.
+  Consumers MAY assume that Events with identical `source` and `id` are duplicates.
+- Examples:
+  - An event counter maintained by the producer
+  - A database commit ID
+  - A UUID
+- Constraints:
+  - REQUIRED
+  - MUST be a non-empty string
 
 ### time