| Class mobility |
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| • | Each model
class is defined as a |
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| parameter
entity, containing |
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| – | a reference to
an initially null |
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| extension class |
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| – | a list of
members |
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| • | To add a new
member to a class, |
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| we redefine
the extension class: |
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| <!ENTITY %
x.class “myChunk|myOther“> |
| 31 |