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Referencing A Number Of Conditions In One Expression
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From IzPack 3.11 on, you don't have to define compound conditions because you can use a simple expression language. The language supports the following operators:
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<dynamicvariables>
<variable name="db.instance" value="MSSQLSERVER" checkonce="true" condition="useMssql+mssqlInstanceSelected+!haveDatabaseURL" />
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Beginning with IzPack 5.0, there is also the possibility to use a more complex expression language which evaluates based on boolean precedence rules, which is also reflected in the following table. The higher an operator is, the higher is its precedence.
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