Sentence:  Imagine a country where children do nothing but play until they start compulsory schooling at age seven. Then, without exception, they attend comprehensives until the age of 16....There are no inspectors, no exams until the age of 18, no school league tables, no private tuition industry, no school <WSD>uniforms</WSD>. [...] 
Meaning of the word marked with <WSD> tags:  A distinctive outfit that serves to identify members of a group.