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WikiMatrix lists a plethora of features for each wiki engine. Select a feature from the list below to get some in-depth description and feel free to improve the documentation
Wiki
feature:structured_data
Data that resides in fixed fields within a record or file. Relational databases and spreadsheets are examples of structured data. Although data in XML files are not fixed in location like traditional database records, they are nevertheless structured, because the data are tagged and can be accurately identified. Contrast with unstructured data.
(Source: http://www.pcmag.com/encyclopedia_term/0,2542,t=structured+data&i=52162,00.asp)