This class scraps the meta data from ONS website
There are 2 kinds of meta data; Timeseries and Dataset
SelectorGadget (from selectorgadget.com) was use to find the required selectors (base_css)
The ONS site is new and bound to undergo changes so should watch out for changes in base_murl and base_css
The meta information are stored in 2 tables in sqlite database ons_timeseries and ons_datasets.
ons_timeseries = has 3 colums (code, caption, url)
The codes in code in code are unique and the the url points to csv files containing the actual time
series data.
ons_datasets has an additional column name url_csv. In this dataset it is rather the url_csv
instead of url which points to csv file containing the actual data.
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