HTML association table extractor

HTML association table extractor is a cousin of HTML property table extractor. Both read simple HTML fragments containing table, tr, and td elements and convert table content to associations.

HTML association table extractor interprets first table row as a list of roles used in associations. Subsequent table rows are interpreted as associations. Each table cell is interpret either as a role or a player of the association.

Extractor can't handle cell merges caused by cellspan and rowspan attributes used in table elements. Also, the extractor doesn't handle nested HTML tables. For example consider rather typical table

Country	Capital	Government	Area	Population
Finland	Helsinki	Parliamentary democracy	338,145 km2	5,297,316
Sweden	Stockholm	Constitutional monarchy	449,964 km2	9,142,817