![How to store data about your data in your data](https://blogs.sas.com/content/sasdummy/files/2013/10/xattrreport.png)
Although the NSA and news media have given metadata a bad name in the popular press, the fact remains that information about the nature of your data is extremely valuable. For example, I posted an article yesterday about data cardinality. Cardinality measures the uniqueness of values in a variable. Cardinality