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<chapter service="bce" number="1">
  <title>Standard Block Chain Engineering Service</title>
  
  <p>
    The <em>Standard Block Chain Engineering</em> service is an
    original implementation of various objects dedicated to the management
    of a block chain. At the bottom of the hierarchy is the the part
    which is assembled in a bill of parts (BOP). The bill is
    associated with a transaction which is time-stamped and
    signed. The transactions are linked together to form a chain.
  </p>

  <!-- general concepts -->
  <section>
    <title>General concepts</title>

    <p>
      The <code>afnix-bce</code> provides the support for manipulating
      block-chain.
    </p>

    <!-- part -->
    <subsect>
      <title>Part</title>
      
      <p>
	The concept of part is central in the <em>bce</em> service. A
	part is any serializable object which is used to assemble a
	bill of parts (BOP).
      </p>
    </subsect>
  </section>
</chapter>
