Orthography and pronunciation

For rules goveruinz orthography and pronunciation of chemical terms see Appendix A. 

A solution to this is to build the lexicon as a relational database. In this, we have exactly one entry for each word. Each entry contains a number of uniquely identified fields, each of which has a single value. For for a simple word, the entry may just contain two fields, ORTHOGRAPHY and PRONUNCIATION. It is a simple matter to add more fields such as POS or SYNCAT. Each entry in a relational database can also be seen as a feature structure of the type we are now familiar with, and because of this similarity, we will use the feature structure terminology for ease of... 

It is often useful to make use of lists as values as we want to describe the full range of possibilities without necessarily ascribing any causes to them. For example, many noun/verb pairs don t differ in orthography or pronunciation, and so for our purposes we treat these as a single word (see Section 4.2). We still wish to record the fact that the word can have several parts of speech this may for instance be used by the POS tagger... 

In speech technology, it is quite often to find existing lexicons in what we can term simple dictionary format. Such lexicons can be stored as simple ascii files, where each entry starts with die orthography, followed by the pronunciation and possibly other information. The entries are ordered by the orthography such that a few typical entries would look like this ... 

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