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-# Rspamd composite symbols
-
-## Introduction
-
-Rspamd composites are used to combine rules and create more complex rules. Composite rules are defined by `composite` keys. The value of the key should be an object that defines the composite's name and value, which is the combination of rules in a joint expression.
-
-For example, you can define a composite that is added when two specific symbols are found:
-
-~~~ucl
-composite {
-	name = "TEST_COMPOSITE";
-	expression = "SYMBOL1 and SYMBOL2";
-}
-~~~
-
-In this case, if a message has both `SYMBOL1` and `SYMBOL2` then they are replaced by symbol `TEST_COMPOSITE`. The weights of `SYMBOL1` and `SYMBOL2` are subtracted from the metric accordingly.
-
-## Composite expressions
-
-You can use the following operations in a composite expression:
-
-* `AND` `&` - matches true only if both operands are true
-* `OR` `|` - matches true if any operands are true
-* `NOT` `!` - matches true if operand is false
-
-You also can use braces to define priorities. Otherwise operators are evaluated from left to right. For example:
-
-~~~ucl
-composite {
-    name = "TEST";
-    expression = "SYMBOL1 and SYMBOL2 and ( not SYMBOL3 | not SYMBOL4 | not SYMBOL5 )";
-}
-~~~
-
-Composite rule can include other composites in the body. There is no restriction on definition order:
-
-~~~ucl
-composite {
-    name = "TEST1";
-    expression = "SYMBOL1 AND TEST2";
-}
-composite {
-    name = "TEST2";
-    expression = "SYMBOL2 OR NOT SYMBOL3";
-}
-~~~
-
-Composites should not be recursive; this is normally detected by Rspamd.
-
-## Composite weight rules
-
-Composites can record symbols in a metric or record their weights. That could be used to create non-captive composites. For example, you have symbol `A` and `B` with weights `W_a` and `W_b` and a composite `C` with weight `W_c`.
-
-* If `C` is `A & B` then if rule `A` and rule `B` matched then these symbols are *removed* and their weights are removed as well, leading to a single symbol `C` with weight `W_c`.
-* If `C` is `-A & B`, then rule `A` is preserved, but the symbol `C` is inserted. The weight of `A` is preserved as well, so the total weight of `-A & B` will be `W_a + W_c`.
-* If `C` is `~A & B`, then rule `A` is *removed* but its weight is *preserved*,
-  leading to a single symbol `C` with weight `W_a + W_c`
-
-When you have multiple composites which include the same symbol and a composite wants to remove the symbol and another composite wants to preserve it, then the symbol is preserved by default. Here are some more examples:
-
-~~~ucl
-composite "COMP1" {
-    expression = "BLAH || !DATE_IN_PAST";
-}
-composite "COMP2" {
-    expression = "!BLAH || DATE_IN_PAST";
-}
-composite "COMP3" {
-    expression = "!BLAH || -DATE_IN_PAST";
-}
-~~~
-
-Both `BLAH` and `DATE_IN_PAST` exist in the message's check results. However, `COMP3` wants to preserve `DATE_IN_PAST` so it will be saved in the output.
-
-If we rewrite the previous example but replace `-` with `~` then `DATE_IN_PAST` will be removed (however, its weight won't be removed):
-
-~~~ucl
-composite "COMP1" {
-    expression = "BLAH || !DATE_IN_PAST";
-}
-composite "COMP2" {
-    expression = "!BLAH || DATE_IN_PAST";
-}
-composite "COMP3" {
-    expression = "!BLAH || ~DATE_IN_PAST";
-}
-~~~
-
-When we want to remove a symbol, despite other composites combinations, it is possible to add the prefix `^` to the symbol:
-
-~~~ucl
-composite "COMP1" {
-    expression = "BLAH || !DATE_IN_PAST";
-}
-composite "COMP2" {
-    expression = "!BLAH || ^DATE_IN_PAST";
-}
-composite "COMP3" {
-    expression = "!BLAH || -DATE_IN_PAST";
-}
-~~~
-
-In this example `COMP3` wants to save `DATE_IN_PAST` once again, however `COMP2` overrides this and removes `DATE_IN_PAST`.
-
-## Composites with symbol groups
-
-It is possible to include a group of symbols in a composite rule. This effectively means **any** symbol of the specified group:
-
-~~~ucl
-composite {
-    name = "TEST2";
-    expression = "SYMBOL2 && !g:mua";
-}
-~~~