Add support to enable multiple metadata value retreival #60
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jbaiter
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Sep 28, 2020
This fixes a faulty heuristic introduced in IIIF-Commons#60, which would override the default locale with the locale of the first label and then attempt to fetch the value with that logic. This heuristic breaks even in the simple case were labels are available in multiple languages, but the values only available in one. If the first language of the labels did not correspond to the language of the value, the client would get no value back. This is clearly in violation of the algorithm prescribed for IIIF property values in the Presentation API spec[1], which states: > If none of the values have a language associated with them, the client > must display all of the values. and > If all of the values have a language associated with them, and none > match the language preference, the client must select a language and > display all of the values associated with that language. as well as > If some of the values have a language associated with them, but none > match the language preference, the client must display all of the values > that do not have a language associated with them. [1] https://iiif.io/api/presentation/2.1/#language-of-property-values
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This pull request aims to add the ability to handle metadata entries that have multiple values. Probably needed to enable ProjectMirador/mirador#2591 .
There are some additional opportunities for a refactor but I held off for now.