This class exposes, through a composition of traits, a comprehensive set of constants that represent property names defined by schema.org and a few custom extensions used by this package. Using constants instead of raw strings prevents typos, eases refactoring, and improves IDE auto-completion.

The constants are imported from multiple Traits (see the org\schema\constants\traits namespace). When this class uses these traits, their constants become available as if they were declared directly on the class, and can therefore be referenced statically (e.g., Schema::NAME, Schema::AT_TYPE, etc.).

Typical use cases include building JSON-LD or other structured data arrays where keys must match schema.org property names exactly.

Example:

use org\schema\constants\Schema ;
$person = new Person
([
    Schema::AT_TYPE => 'Person',
    Schema::NAME    => 'Alice',
    Schema::URL     => 'https://example.com/alice',
]);

Notes:

• This class is intentionally lightweight and contains no methods or state; it only aggregates constants.
• If you prefer a shorter alias, you can import it as "Schema" or any name of your choice via PHP's use-as syntax.