Biological ontologies are directed acyclic graphs of controlled vocabularies. The elements of the RSS vocabulary are not generally reusable in other XML vocabularies. These schemes include controlled vocabularies and formal notations or parsing rules. TTS engines with different languages, dialects and specialized vocabularies are available through third-party publishers. Each of these "n "controlled vocabularies is an ontology with approximately 300k terms. There are also many Philippine Negrito languages that have unique vocabularies that survived Austronesian acculturation. Later he wrote an account including some ethnographic and linguistic notes and vocabularies. These vocabularies tend to deal with more complicated concepts. Many of its vocabularies are derived from the Syriac language. RDFa 1.1 automatically includes prefixes for popular vocabularies such as FOAF. These writing standards include but are not limited to specialized vocabularies and particular genres. Some indexers with expertise in controlled vocabularies also work as taxonomists and ontologists. WordNet can also be used to inter-link other vocabularies. Different characters use different vocabularies and rhythms of speech. Children rely on pragmatic skills to build more extensive vocabularies.