Infobox parts are mistaken for abstracts in page abstract dumps.
For example at http://dumps.wikimedia.org/enwiki/20150901/enwiki-20150901-abstract24.xml line 20 is:
"<abstract>| birth_place = Veracruz, Mexico</abstract>".
This record is about https://en.wikipedia.org/wiki/Roberto_Bueno_Campos and should be something like:
"<abstract>Roberto Eugenio Bueno Campos (born 21 January 1946) is a Mexican politician from the National Action Party.</abstract>".