Schema template declaration. A TEMPLATE name BEGIN … END; block allows you to declare a reusable group of objects once.
Schema template application. A APPLY TEMPLATE name IN SCHEMA a, b; statement instantiates a template into each named schema.
Table templates. A TEMPLATE name FOR TABLE BEGIN … END; block declares reusable table members.
Index name validation. Duplicate index and index-backed constraint names (primary key, unique, exclusion) within a schema are now rejected at validation time.
DdlDocument.Templates carries the parsed template constructs for consumers of the reader — a TemplateSet of definitions, applications, and includes.
The formatter lays out TEMPLATE blocks canonically: header and BEGIN/END on their own lines, inner statements formatted as usual and indented one level.
