I must take back my earlier statement. I thought you meant a feature with
multiple associated geometries. A classic example is where the road feature
has a curbs geometry and a center-line geometry - each suitable for
representing the road in different circumstances.
I see what you want is to have a complex geometry, and then place transformed
copies of it in a variety of places.
Thinking about it, HTML and CSS don't support multiple instancing
either. They're mostly thought of as a kind of simple transport
format that exports a portion of some internal and richer data model.
What I want is a shared grammar that captures a sizable chunk of
reality. Beyond multiple instancing I would like to also express
geometry parametrically and I'd like to express linear constraints,
such as rigid body constraints, friction, and other kinds of physical
relationships between things. Ideally I'd use such a grammar to
build predictive models of watersheds and ecosystems. For example to
attempt to define the relationships between a river, a factory, the
fish, the economy, the local incomes. This could help shift the
debate over protecting our ecosystems away from rhetoric and towards
to one based on tangible models that everybody could explore in depth
themselves.
- a
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