1 files changed, 23 insertions, 2 deletions

diff --git a/33.md b/33.md
index db572ad..10681fa 100644
--- a/33.md
+++ b/33.md
@@ -10,10 +10,14 @@ This NIP adds a new event range that allows for replacement of events that have
 
 Implementation
 --------------
+The value of a tag is defined as the first parameter of a tag after the tag name.
+
 A *parameterized replaceable event* is defined as an event with a kind `30000 <= n < 40000`.
 Upon a parameterized replaceable event with a newer timestamp than the currently known latest
-replaceable event with the same kind and first `d` tag value being received, the old event
-SHOULD be discarded and replaced with the newer event.
+replaceable event with the same kind, author and first `d` tag value being received, the old event
+SHOULD be discarded, effectively replacing what gets returned when querying for
+`author:kind:d-tag` tuples.
+
 A missing or a `d` tag with no value should be interpreted equivalent to a `d` tag with the
 value as an empty string. Events from the same author with any of the following `tags`
 replace each other:
@@ -24,6 +28,23 @@ replace each other:
 * `"tags":[["d",""],["d","not empty"]]`: only first `d` tag is considered
 * `"tags":[["d"],["d","some value"]]`: only first `d` tag is considered
 * `"tags":[["e"]]`: same as no tags
+* `"tags":[["d","","1"]]`: only the first value is considered (`""`)
+
+Clients SHOULD NOT use `d` tags with multiple values and SHOULD include the `d` tag even if it has no value to allow querying using the `#d` filter.
+
+Referencing and tagging
+-----------------------
+
+Normally (as per NIP-01, NIP-12) the `"p"` tag is used for referencing public keys and the
+`"e"` tag for referencing event ids and the `note`, `npub`, `nprofile` or `nevent` are their
+equivalents for event tags (i.e. an `nprofile` is generally translated into a tag
+`["p", "<event hex id>", "<relay url>"]`).
+
+To support linking to parameterized replaceable events, the `naddr` code is introduced on
+NIP-19. It includes the public key of the event author and the `d` tag (and relays) such that
+the referenced combination of public key and `d` tag can be found.
+
+The equivalent in `tags` to the `naddr` code is the tag `"a"`, comprised of `["a", "<kind>:<pubkey>:<d-identifier>", "<relay url>"]`.
 
 Client Behavior
 ---------------