Make Hierarchical Associative Arrays 

Make a hierarchical database of the auction prices of paintings.

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X data = <|"Document" -> <|"Attributes" -> <|"Version" -> "1.0", "Encoding" -> "ISO8859-1"|>, "Content" -> {<|"TITLE" -> "No. 5, 1948", "ARTIST" -> "Jackson Pollock", "YEAR" -> "1948", "PRICE" -> "$140,000,000"|>, <|"TITLE" -> "Woman III", "ARTIST" -> "Willem de Kooning", "YEAR" -> "1953", "PRICE" -> "$137,500,000"|>, <|"TITLE" -> "Portrait of Adele Bloch-Bauer I", "ARTIST" -> "Gustav Klimt", "YEAR" -> "1907", "PRICE" -> "$135,000,000"|>}|>|>;

Extract the content from the database.

In[2]:=

X data["Document", "Content"] // Dataset

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Extract the version information from the database.

In[3]:=

X data["Document", "Attributes"] // Dataset

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