All classes that implement purl_processor in Persistent URL 7
- class \purl_domain implements purl_processor
- class \purl_extension implements purl_processor
- class \purl_pair
- class \purl_path implements purl_processor
- class \purl_querystring implements purl_processor
- class \purl_subdomain implements purl_processor
- class \purl_useragent implements purl_processor