intro + subsection headings for NEXT

Author: rsill-neo4j

modules/ROOT/pages/queries/composed-queries/sequential-queries.adoc

@@ -1,12 +1,77 @@
 = Sequential queries (`NEXT`)
-:description: Information about how to use `NEXT` to construct conditional queries in Cypher.
+:description: Information about how to use `NEXT` to construct sequential queries in Cypher.
 :page-role: new-2025.06
 
-////
-Benefits to this proposal
+`NEXT` allows for linear composition of queries into a sequence of smaller, self-contained segments while making return values from one segment available in the next.
 
-Increases the modularity (and readability) of Cypher — allows for the partition of large queries into smaller, self contained modules that are possible to chain together using NEXT.
-Decreases the reliance on CALL and WITH for constructing complex queries.
-Improves usability of conditional and union queries.
-Improves Cypher GQL conformance.
-////
+`NEXT` has a number of benefits:
+
+* `NEXT` can improve the modularity and readability of complex queries.
+* `NEXT` reduces the need to rely on the xref:clauses/call.adoc[CALL] and xref:clauses/with.adoc[] clauses to construct complex queries.
+* `NEXT` improves the usability of xref:queries/composed-queries/conditional-queries.adoc[conditional] and xref:queries/composed-queries/combined-queries.adoc[UNION] queries.
+
+`NEXT` was introduced as part of Cypher's xref:appendix/gql-conformance/index.adoc[].
+
+
+
+[[example-graph]]
+== Example graph
+
+The following graph is used for the examples on this page:
+
+image::conditional_query_graph.svg[width="700",role="middle"]
+
+To recreate the graph, run the following query against an empty Neo4j database:
+
+[source, cypher, role=test-setup]
+----
+CREATE (alice:Person {name:'Alice', age: 65}),
+       (bob:Person {name: 'Bob', age: 25}),
+       (charlie:Person {name: 'Charlie', age: 61}),
+       (daniel:Person {name: 'Daniel', age: 39}),
+       (eskil:Person {name: 'Eskil', age: 39}),
+       (bob)-[:WORKS_FOR]->(alice),
+       (alice)-[:WORKS_FOR]->(daniel),
+       (charlie)-[:WORKS_FOR]->(daniel),
+       (bob)-[:LOVES]->(eskil),
+       (charlie)-[:LOVES]->(alice)
+----
+
+
+[[sequential-syntax]]
+== Syntax
+
+Lorem ipsum.
+
+
+[[sequential-rules]]
+== Rules
+
+Lorem ipsum.
+
+.Not allowed: not aliasing returned expressions
+[source, cypher, role=test-fail]
+----
+WHEN true THEN RETURN 2
+ELSE RETURN 3
+----
+
+
+== Using `NEXT` instead of `CALL`
+
+Lorem ipsum.
+
+
+== Using `NEXT` instead of `WITH`
+
+Lorem ipsum.
+
+
+== Interactions with conditional queries
+
+Lorem ipsum.
+
+
+== Interactions with `UNION` queries
+
+Lorem ipsum.