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The model definition file

This is a small TypeScript source code file that tells us how to define our model.

In the case of the wordlist lexical models, the model definition file indicates where find to find the TSV source files, as well as gives us the option to tell the compiler a little bit more about our language’s spelling system or orthography.

The model definition template

Keyman Developer provides a default model definition similar to the following. If you want to create the file yourself, copy-paste the following template, and save it as model.ts. Place this file in the same folder as wordlist.tsv.

/*
  sencoten 1.0 generated from template.

  This is a minimal lexical model source that uses a tab delimited wordlist.
  See documentation online at https://help.keyman.com/developer/ for
  additional parameters.
*/

const source: LexicalModelSource = {
  format: 'trie-1.0',
  wordBreaker: {
    use: 'default',
  },
  sources: ['wordlist.tsv'],
};
export default source;

Let's step through this file, line-by-line.

On the first line, we're declaring the source code of a new lexical model.

const source: LexicalModelSource = {

On the second line, we're saying the lexical model will use the trie-1.0 format. The trie format creates a lexical model from one or more word lists; the trie structures the lexical model such that it can predict through thousands of words very quickly.

  format: 'trie-1.0',

On lines 3–5, we're specifying the word breaking algorithm that we want to use. Keyman supplies a default algorithm that conforms to the rules expected for many languages.

  wordBreaker: {
  use: 'default',
},

On the sixth line, we're telling the trie where to find our wordlist.

  sources: ['wordlist.tsv'],

The seventh line marks the termination of the lexical model source code. If we specify any customizations, they must be declared above this line:

};

The eighth line is necessary to allow external applications to read the lexical model source code.

export default source;

Customizing our lexical model

The template, as described in the previous section, is a good starting point, and may be all you need for you language. However, most language require a few customizations. The trie-1.0 wordlist model supports the following customizations:

Punctuation
How to define certain punctuation in your language
Word breaker
How to determine when words start and end in the writing system
Search term to key
How and when to ignore accents and letter case

To see all of the things possible in a model definition file, see the LexicalModelSource interface.