get schema() {
        return this.dataModel.getSchema();
    }
@summary Convenience getter/setter.
@desc Calls the data model's `getSchema`/`setSchema` methods.
@see {@link https://fin-hypergrid.github.io/doc/DataModel.html#getSchema|getSchema}
@see {@link https://fin-hypergrid.github.io/doc/DataModel.html#setSchema|setSchema}
@type {Array}
@memberOf Local#