activemq-artemis/docs/design-guide/en/about.xml

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<!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN" "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
<!ENTITY % BOOK_ENTITIES SYSTEM "ActiveMQ_Design_Guide.ent">
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<chapter id="about">
   <title>About ActiveMQ</title>
    <para>What is ActiveMQ?</para>
</chapter>