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(SelectionString, TopologyData) -> AtomIndices
Parse and evaluate a spatial and attribute-based query string against molecular metadata to resolve a subset of atom indices.
Problem it solves
Selecting specific atoms (e.g., 'protein and name CA') dynamically from large topologies is difficult without a query language.
Consumes
Emits
The real projects this mechanism was found in. Attribution is the point — this is how the best teams actually do it.