Xpath: If inside a node, test to see if it is located inside a certain attribute and if there is another similar node

I have this xml file

<book>
<chapter category="AIRCRAFT">
  <title>Flight Controls</title>
  <section>Bombardier</title>
    <orderedlist>
        <listitem><para>list item 1</para></listitem>
        <listitem><para>list item 2</para></listitem>
        <listitem><para>list item 3</para></listitem>
    </orderedlist>
  </section>
</chapter>

<chapter category="PILOT">
  <title>Flight Operations</title>
  <section>
    <title>Crew Bases</title>
    <orderedlist>
        <listitem><para>list item 1</para></listitem>
        <listitem><para>list item 2
            <note>
                <para>Note: Additional information.</para>
            </note>
            </para>
        </listitem>
        <listitem><para>list item 3</para></listitem>
    </orderedlist>
  </section>
</chapter>

<chapter category="MAINTENANCE">
  <title>Maintenance</title>
  <section>
    <title>Maintenance Bases</title>
    <orderedlist>
        <listitem><para>list item 1</para></listitem>
        <listitem><para>list item 2</para></listitem>
        <listitem><para>list item 3</para></listitem>
    </orderedlist>
  </section>
</chapter>

<chapter category="COMPANY">
  <title>Company Policy Manual</title>
  <section>
    <title>Employment Standards and Eligibility</title>
    <orderedlist>
        <listitem><para>list item 1</para></listitem>
        <listitem><para>list item 2</para></listitem>
        <listitem><para>list item 3</para></listitem>
    </orderedlist>
  </section>
</chapter>

</book>  

I need to answer these two questions:

1)If inside a para element, test to see if it is located inside the chapter with the category attribute set to “MAINTENANCE”

2)If inside a listitem element, test to see if there is another listitem before it

I need just the statements.