Couldn't you just make properties from -D not read-only and just have a higher precedence than <property> ? I know in Ant -D has higher precedence. if(property set via -D) { don't throw } ?
Just to clarify...
In Ant, all properties are read-only... that is, they always keep the first value they are set to. -D has higher precedence because the property is set before the project is executed!
Put another way, Ant didn't require any special logic for -D to override <property>... NAnt is more complex (but more flexible!) by allowing properties to be mutable.
-- Troy
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