NIP-91: AND operator for filters (Formerly NIP-119) (#1365)

Co-authored-by: dskvr <dskvr@users.noreply.github.com>

1 files changed, 18 insertions, 0 deletions

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+# NIP-91: AND Operator in Filters
+
+Enable `AND` within a single tag filter by using an `&` modifier in filters for indexable tags.
+
+```
+filters: {
+  "kinds": [1],
+  "&t": ["meme", "cat"],
+  "#t": ["black", "white"]
+}
+// returns kind `1` events with `t` tags that have both "meme" and "cat" that have the tag "black" or "white"
+```
+
+## Rules
+
+- `AND` **MUST** take precedence over `OR`
+- Tag values used in `AND` **SHOULD NOT** be used in standard `OR` tags [`#`]
+- Any tag value used in `AND` **SHOULD** be ignored in `OR`