pub type CodeLookupKey = (String, String, Option<String>, usize, usize);Expand description
Lookup key: (source_path, segment_tag, qualifier, element_index, component_index).
source_path matches the TOML source_path field (e.g., “sg4.sg8_z01.sg10”).
segment_tag is uppercase (e.g., “CCI”, “CAV”).
qualifier is the segment’s discriminating qualifier when one applies (RFF/STS/CCI:
element 0 component 0; DTM: c507.d2005). None for segments without a qualifier
convention. The qualifier slot scopes lookups so that, for instance, RFF+TN’s
type=data d1154 (free-text Vorgangsnummer) is not confused with RFF+Z13’s
type=code d1154 (PID-identifier) at the same path/elem/comp.