% A few silly but simple examples.

@book{demo-001,
    author = "Hans Hagen",
    title  = "\BIBTEX, the \CONTEXT\ way",
    year   = "2013",
}

@book{demo-002,
    crossref = "demo-001"
    year     = "2014",
}

@book{demo-003,
    author  = "Hans Hagen and Ton Otten",
    title   = "Typesetting education documents",
    year    = "1996",
    comment = "a non-existing document",
}

@book{demo-004,
    author  = "Luigi Scarso",
    title   = "Designing high speed trains properly!",
    year    = "2021",
    comment = "still to be published",
}

@book{demo-005,
    author   = "author",
    title    = "title",
    year     = "year",
    serial   = "serial",
    doi      = "doi",
    url      = "url",
    pages    = "pages",
    language = "en",
}

@book{demo-006,
    author  = "Hans Hagen, Kees van Marle and Ton Otten",
    title   = "Why do we always have lack of time?",
    year    = "2014",
    comment = "yet another non-existing document",
}