added a bit a documention on the field structIsChildOf_fs

src/HAL/Doc/Document.hs

@@ -51,6 +51,17 @@ instance FromJSON Document where
     let _document_struct_id = map fst structIdname
     let _document_authors_affiliations = map snd structIdname
 
+
+{- 
+structIsChildOf_fs is a field in the HAL API that is a list that goes by pair
+here is an exemple :
+https://api.archives-ouvertes.fr/search/?q=(en_title_t:(glass)%20OR%20en_abstract_t:(glass))%20AND%20(structId_i:6279)%20AND%20(language_s:en)&wt=json&fl=docid,label_s,uri_s,structId_i,title_s,structIsChildOf_fs&rows=80) 
+
+the first line of a pair tells you which type of a structure the child is (e.g. laboratory, institution, etc...)
+the second line tells you what is the structId and name of the child structure aswell as the strucId of the parent and the name of the parent structure
+
+for now we are not using the type of structure that's why we have a removeUnusedData that removes the first line of each pair
+-}
     structChild <- o .:? "structIsChildOf_fs" :: Parser (Maybe [Text])
 
     let _document_institutes_tree = Map.fromListWith (++) $ getStructParentChild $ removeUnusedData $ fromMaybe [] structChild