Tag: sequence - adamb924/mortal-engine GitHub Wiki

A <sequence> is like a dumb <fork> a sequence of morphemes (or other nodes) which either occur all together, or do not occur at all.

Suppose we have a language were the word begins with a verb stem. It can occur alone, or it can be followed by the “One” suffix followed by the “Two” suffix.

The example below (from examples/08-Sequences.xml) shows this kind of morphology:

<?xml version="1.0" encoding="UTF-8"?>
<morphology
    xmlns="https://www.adambaker.org/mortal-engine"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="https://www.adambaker.org/mortal-engine morphology.xsd">
    <writing-systems src="writing-systems.xml"/>
    <model label="Nouns">
        <stem-list label="Stem">
            <filename>01-stems.xml</filename>
            <matching-tag>verb</matching-tag>
        </stem-list>
        <sequence label="My sequence">
            <optional/>
            <morpheme label="First">
                <allomorph>
                    <form lang="wk-LA">One</form>
                </allomorph>
            </morpheme>
            <morpheme label="Second">
                <allomorph>
                    <form lang="wk-LA">Two</form>
                </allomorph>
            </morpheme>
        </sequence>
    </model>
</morphology>

The output of the tests in examples/all-examples.xml shows the result: you can get the bare stem, or the bare stem followed by “One” and “Two”, but neither of those suffixes can occur alone.

Success: The input bil (wk-LA) was accepted by the model, which is correct. [Stem]
Success: The input bilOneTwo (wk-LA) was accepted by the model, which is correct. [Stem][First][Second]
Success: The input bilOne (wk-LA) was rejected by the model, which is correct. 
Success: The input bilTwo (wk-LA) was rejected by the model, which is correct.

It is possible to have a <sequence> without the <optional/> tag, but that would be the same as just having the nodes there.

Any node can occur within a <sequence>, not just <morpheme> nodes.

In particular, you can put a <jump> tag into a <sequence>. For instance, you could add a nominalizer morpheme, and then jump to the a node in the noun model.

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