JBehave stories are normally written using JBehave syntax where the requirement is expressed in the Narrative section using 'In order to', 'As a', 'I want to' construct however it additionally supports writing stories in a more Cucumber like syntax where a Feature keyword at the top of the story file is used to capture the requirement rather than the Narrative keyword and also the use of some of the other keywords differ, for example the use of Background keyword instead of Lifecycle. See more information in the official JBehave documentation here.
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