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Inflation_Index

Inflation Index is a Quotable that represents the reference index used in the calculation of any inflation-linked cash flow.
Note this is generally not the same as the underlying raw inflation index being published at regular time intervals.
The reference index here may belong to one of the types described in
Inflation Index::Quote Type
The Relative type differs from the underlying raw inflation index to the extent that interpolation is applied on no-publication dates or revision of the initial published data is required.
The YoY Rate type is completely different, since it refers to the year-on-year inflation rate rather than the underlying raw inflation index.