Wolfram Language™

Find Country Entities in Texts

This example shows another application of TextCases, in this case to recognize countries in a given text.

Construct a list of three historical periods.

In[1]:=

periods = {Entity["HistoricalPeriod", "EuropeanRenaissance"], Entity["HistoricalPeriod", "AgeEnlightenment"], Entity["HistoricalPeriod", "IndustrialRevolution"]};

Extract their respective names.

In[2]:=

names = CommonName[periods]

Out[2]=

Use WikipediaData to retrieve the text on the page for each historical era.

In[3]:=

wikipages = WikipediaData /@ names;

Use TextCases to extract the countries mentioned on each of those pages, deleting duplicate mentions.

In[4]:=

countries = DeleteDuplicates[TextCases[#, "Country" -> "Interpretation"]] & /@ wikipages;

For instance, these are the countries found on the page for the European Renaissance.

In[5]:=

First[countries]

Out[5]=

Plot on respective world maps the countries mentioned in each article.

In[6]:=

countries = DeleteCases[countries, Entity["Country", "World"], {2}]; Table[ GeoGraphics[{ EdgeForm[{Black}], Red, Polygon /@ countries[[i]] }, GeoRange -> "World", ImageSize -> 400, PlotLabel -> names[[i]], GeoBackground -> "Coastlines" ], {i, 3} ]

Out[6]=