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                  <phrase>(Un)Expand</phrase>
                </textobject>
              </inlinemediaobject> </guibutton> to expand the constraints to
            auxiliary nodes in the query tree. The result will look like
            this:</para>

            <mediaobject>
              <imageobject role="html">
                <imagedata align="center" fileref="tutorial_queries_1.png"
                           format="PNG" />
              </imageobject>
            </mediaobject>
          </listitem>

          <listitem>
            <para>Select the auxiliary node representing the constraint
            <literal>functor="DPHR"</literal> and press <keysym>o</keysym> or
            <guibutton> <inlinemediaobject>
                <imageobject role="html">
                  <imagedata contentdepth="10pt" fileref="pmltq_icons/or.png"
                             format="PNG" />
                </imageobject>

                <textobject>
                  <phrase>OR</phrase>
                </textobject>
              </inlinemediaobject> </guibutton> to create an auxiliary
            <literal>OR</literal> node above it.</para>
          </listitem>

          <listitem>
            <para>Select the <literal>OR</literal> node and press
            <keysym>=</keysym> or <guibutton> <inlinemediaobject>
                <imageobject role="html">
                  <imagedata contentdepth="10pt"
                             fileref="pmltq_icons/test_equality.png"
                             format="PNG" />
                </imageobject>

                <textobject>
                  <phrase>Equality</phrase>
                </textobject>
              </inlinemediaobject> </guibutton> to create a new equality
            constraint and as above, fill <literal>functor</literal> as
            <literal>a</literal> and <literal>"CPHR"</literal> as
            <literal>b</literal> in the form. Alternatively, you can select
            the node <literal>functor="DPHR"</literal>, press <keycombo
                action="simul">
                <keysym>Ctrl</keysym>

                <keysym>Insert</keysym>
              </keycombo> or <guibutton> <inlinemediaobject>
                <imageobject role="html">
                  <imagedata contentdepth="10pt" fileref="icons/editcopy.png"
                             format="PNG" />
                </imageobject>

                <textobject>
                  <phrase>Copy</phrase>
                </textobject>
              </inlinemediaobject> </guibutton> to copy it into the clipboard,
            then select the <literal>OR</literal> node and press <keycombo
                action="simul">
                <keysym>Shift</keysym>

                <keysym>Insert</keysym>
              </keycombo> or <guibutton> <inlinemediaobject>
                <imageobject role="html">
                  <imagedata contentdepth="10pt" fileref="icons/editpaste.png"
                             format="PNG" />
                </imageobject>

                <textobject>
                  <phrase>Paste</phrase>
                </textobject>
              </inlinemediaobject> </guibutton> to paste it. Then press
            <keysym>Enter</keysym> or double-click the node or just the word
            <literal>"DPHR"</literal> on one of the two nodes and change
            <literal>"DPHR"</literal> to <literal>"CPHR"</literal>.</para>
          </listitem>

          <listitem>
            <para>The result will look like this: <mediaobject>
                <imageobject role="html">
                  <imagedata align="center" fileref="tutorial_queries_2b.png"
                             format="PNG" />
                </imageobject>

                <imageobject role="fo">
                  <imagedata align="center" fileref="tutorial_queries_2b.pdf"
                             format="PDF" />
                </imageobject>
              </mediaobject> Selecting the top t-node and pressing
            <keysym>h</keysym> or <guibutton> <inlinemediaobject>
                <imageobject role="html">
                  <imagedata contentdepth="10pt"
                             fileref="pmltq_icons/toggle_hide_subtree.png"
                             format="PNG" />
                </imageobject>

                <textobject>
                  <phrase>(Un)Expand</phrase>
                </textobject>
              </inlinemediaobject> </guibutton> hides the auxiliary nodes, and
            gives this: <mediaobject>
                <imageobject role="html">
                  <imagedata align="center" fileref="tutorial_queries_2c.png"
                             format="PNG" />
                </imageobject>
              </mediaobject></para>
          </listitem>
        </orderedlist></para>

      <para>Using a regular expression: <programlisting>t-node [ functor ~ '[CD]PHR', t-node [ ] ]</programlisting>
      Symbol <literal>~</literal> (tilde) denotes a binary relation between
      two values that is true if and only if the value on the left interpreted
      as string matches the value on the right interpreted as regular
      expression. The regular expression <literal>[CD]PHR</literal> is matched
      by any string containing either <literal>CPHR</literal> or
      <literal>DPHR</literal> as a substring. If, for example,
      <literal>XDPHR</literal> were a possible functor value, we would have to