Code doesn't respect the maximum size for the Opensearch description tags content

As the module accepts placeholders for some of the Opensearch tags, it should truncate the tags content to the size suggested by the Opensearch specifications (http://www.opensearch.org/Specifications/OpenSearch/1.1).
The module, in example, accepts a 16 characters string for the short name, but it doesn't truncate the string to that size, once the placeholders are replaced.