add language version control commands

Author: JPryce-Aklundh

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

@@ -186,6 +186,91 @@ For more information, see link:{neo4j-docs-base-uri}/operations-manual/current/d
 | Feature
 | Details
 
+a|
+label:functionality[]
+label:new[]
+
+[source, cypher, role="noheader"]
+----
+CREATE [COMPOSITE] DATABASE actors DEFAULT LANGUAGE CYPHER 25
+----
+
+a| Set the default Cypher version for a standard or composite database when creating it.
+The available versions are `CYPHER 25` and `CYPHER 5`.
+If not specified, the default language for the database is set to the default language of the DBMS.
+For more information, see the following sections in the Operations Manual:
+
+* link:{neo4j-docs-base-uri}/operations-manual/current/database-administration/standard-databases/create-databases/#_create_a_database_with_default_language[Create a database with a `DEFAULT LANGUAGE`].
+* link:{neo4j-docs-base-uri}/operations-manual/current/database-administration/composite-databases/create-composite-databases/#composite-databases-default-language[Set the default Cypher version for a composite database].
+
+a|
+label:functionality[]
+label:new[]
+
+[source, cypher, role="noheader"]
+----
+CREATE ALIAS `remote-with-default-language` FOR DATABASE `northwind-graph-2020`
+AT "neo4j+s://location:7687"
+USER alice
+PASSWORD 'example_secret'
+DEFAULT LANGUAGE CYPHER 25
+----
+
+a| Set the default Cypher version for a remote database alias when creating it.
+The available versions are `CYPHER 5` and `CYPHER 25`.
+Local database aliases cannot be assigned a default Cypher version; they always have the Cypher version of their target database.
+For more information, see the link:{neo4j-docs-base-uri}/operations-manual/current/database-administration/aliases/manage-aliases-standard-databases/#_set_a_default_cypher_version_for_remote_database_aliases[Operations Manual -> Set a default Cypher version for remote database aliases].
+
+a|
+label:functionality[]
+label:new[]
+[source, cypher, role="noheader"]
+----
+ALTER DATABASE movies SET DEFAULT LANGUAGE CYPHER 25
+----
+
+a| Alter the default Cypher version of an existing standard or composite database.
+The available versions are `CYPHER 25` and `CYPHER 5`.
+For more information, see the link:{neo4j-docs-base-uri}/operations-manual/current/database-administration/standard-databases/alter-databases/#alter-database-default-language[Operations Manual -> Alter database default language].
+
+a|
+label:functionality[]
+label:new[]
+
+[source, cypher, role="noheader"]
+----
+ALTER ALIAS `remote-with-default-language` SET DATABASE DEFAULT LANGUAGE CYPHER 5
+----
+
+a| Alter the default Cypher version of a remote database alias.
+The available versions are `CYPHER 25` and `CYPHER 5`.
+It is not possible to alter the default language of a local database alias; they always have the default language of their target database.
+For more information, see the link:{neo4j-docs-base-uri}/operations-manual/current/database-administration/aliases/manage-aliases-standard-databases/#_alter_the_default_cypher_version_of_a_remote_database_alias[Operations Manual -> Alter the default Cypher version of a remote database alias].
+
+a|
+label:functionality[]
+label:new[]
+
+[source, cypher, role="noheader"]
+----
+SHOW DATABASES YIELD name, defaultLanguage
+----
+
+a| The new return column `defaultLanguage` for the `SHOW DATABASE` command returns the default language of a database.
+For more information, see the link:{neo4j-docs-base-uri}/operations-manual/current/database-administration/standard-databases/listing-databases/#_show_the_default_cypher_version_of_a_database[Operations Manual -> Show the default Cypher version of a database].
+
+a|
+label:functionality[]
+label:new[]
+
+[source, cypher, role="noheader"]
+----
+SHOW ALIAS `remote-with-default-language` FOR DATABASE YIELD name, defaultLanguage
+----
+
+a| The new return column `defaultLanguage` for the `SHOW ALIAS` command returns the default language of a database alias.
+For more information, see the link:{neo4j-docs-base-uri}/operations-manual/current/database-administration/standard-databases/listing-databases/#_show_the_default_cypher_version_of_a_database[Operations Manual -> Show the default Cypher version of a database].
+
 a|
 label:functionality[]
 label:updated[]
@@ -295,6 +380,22 @@ a|
 label:functionality[]
 label:new[]
 
+[source, cypher, role="noheader"]
+----
+CYPHER 25
+MATCH (n:Person)
+FILTER n.age < 35
+RETURN n.name AS name
+----
+
+a| New query option: `CYPHER 25`.
+Prepending a query with `CYPHER 25` ensures that a query is run with Cypher 25, regardless of the default language of a database.
+(The ability to select `CYPHER 5` was introduced in Neo4j 5.21).
+
+a|
+label:functionality[]
+label:new[]
+
 [source, cypher, role="noheader"]
 ----
 RETURN 1 AS a