public Map<String, Schema> getDefinitions() {
        return definitions;
    }
Gets all of the schema definitions defined in the "definitions" map.

@return Returns the defined schema definitions.
@see <a href="https://json-schema.org/latest/json-schema-validation.html#rfc.section.9">Schema reuse with "definitions"</a>
smithy-jsonschema/src/main/java/software/amazon/smithy/jsonschema/SchemaDocument.java