Add docs for new normalize function.

modules/ROOT/pages/deprecations-additions-removals-compatibility.adoc

@@ -16,6 +16,30 @@ New features are added to the language continuously, and occasionally, some feat
 This section lists all of the features that have been removed, deprecated, added, or extended in different Cypher versions.
 Replacement syntax for deprecated and removed features are also indicated.
 
+[[cypher-deprecations-additions-removals-5.16]]
+== Neo4j 5.16
+
+=== New features
+
+[cols="2", options="header"]
+|===
+| Feature
+| Details
+
+a|
+label:functionality[]
+label:new[]
+
+[source, cypher, role=noheader]
+----
+RETURN normalize("string", NFC)
+----
+
+| Introduction of a xref::functions/string.adoc#functions-normalize[normalize()] function.
+Normalize a `STRING` according to the specified normalization form, which can be of type `NFC`, `NFD`, `NFKC` or `NFKD`.
+
+|===
+
 [[cypher-deprecations-additions-removals-5.15]]
 == Neo4j 5.15
 
@@ -92,7 +116,7 @@ label:updated[]
 MATCH (n:Label) WHERE $param IS :: STRING NOT NULL AND n.prop = $param
 ----
 
-| `IS :: STRING NOT NULL` is now an xref:planning-and-tuning/query-tuning/indexes.adoc#text-index-type-predicate-expressions[index-compatible predicate]. 
+| `IS :: STRING NOT NULL` is now an xref:planning-and-tuning/query-tuning/indexes.adoc#text-index-type-predicate-expressions[index-compatible predicate].
 
 |===
 

modules/ROOT/pages/functions/index.adoc

@@ -496,6 +496,12 @@ These functions are used to manipulate strings or to create a string representat
 | `ltrim(input :: STRING) :: STRING`
 | Returns the given `STRING` with leading whitespace removed.
 
+1.2+| xref::functions/string.adoc#functions-normalize[`normalize()`]
+| `normalize(input :: STRING) :: STRING`
+| Returns the given `STRING` normalized using the normal form 'NFC'.
+| `normalize(input :: STRING, normalForm = NFC :: [NFC, NFD, NFKC, NFKD]) :: STRING`
+| Returns the given `STRING` normalized according to the specified normalization form.
+
 1.1+| xref::functions/string.adoc#functions-replace[`replace()`]
 | `replace(original :: STRING, search :: STRING, replace :: STRING) :: STRING`
 | Returns a `STRING` in which all occurrences of a specified search `STRING` in the given `STRING` have been replaced by another (specified) replacement `STRING`.

modules/ROOT/pages/functions/string.adoc

@@ -148,6 +148,136 @@ RETURN ltrim('   hello')
 
 ======
 
+
+
+[[functions-normalize]]
+== normalize()
+
+`normalize()` returns the given `STRING` normalized using the `NFC` normalization form.
+
+*Syntax:*
+
+[source, syntax, role="noheader"]
+----
+normalize(input)
+----
+
+*Returns:*
+
+|===
+
+| `STRING`
+
+|===
+
+*Arguments:*
+
+[options="header"]
+|===
+| Name | Description
+
+| `input`
+| An expression that returns a `STRING`.
+
+|===
+
+*Considerations:*
+
+|===
+
+| `normalize(null)` returns `null`.
+
+|===
+
+
+.+normalize()+
+======
+
+.Query
+[source, cypher, indent=0]
+----
+RETURN normalize('\u212B') = '\u00C5' AS result
+----
+
+.Result
+[role="queryresult",options="header,footer",cols="1*<m"]
+|===
+
+| +result+
+| +true+
+1+d|Rows: 1
+
+|===
+
+======
+
+
+[[functions-normalize-with-normal-form]]
+== normalize(), with specified normal form
+
+`normalize()` returns the given `STRING` normalized using the specified normalization form.
+The normalization form can be of type `NFC`, `NFD`, `NFKC` or `NFKD`.
+
+*Syntax:*
+
+[source, syntax, role="noheader"]
+----
+normalize(input, normalForm)
+----
+
+*Returns:*
+
+|===
+
+| `STRING`
+
+|===
+
+*Arguments:*
+
+[options="header"]
+|===
+| Name | Description
+
+| `input`
+| An expression that returns a `STRING`.
+
+
+| `normalForm`
+| A keyword specifying the normal form, can be `NFC`, `NFD`, `NFKC` or `NFKD`.
+
+|===
+
+*Considerations:*
+
+|===
+
+| `normalize(null, NFC)` returns `null`.
+
+|===
+
+
+.+normalize()+
+======
+
+.Query
+[source, cypher, indent=0]
+----
+RETURN normalize('\uFE64', NFKC) = '\u003C' AS result
+----
+
+.Result
+[role="queryresult",options="header,footer",cols="1*<m"]
+|===
+
+| +result+
+| +true+
+1+d|Rows: 1
+
+|===
+
+======
+
 [[functions-replace]]
 == replace()