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        <listitem>
          <para>Method 1: Click on&nbsp;
             <inlinemediaobject>
                <imageobject role="html">
                   <imagedata contentdepth="20pt"
                      fileref="images/callouts/toolbar-NodeTypes.png" format="PNG" />
                </imageobject>
                <textobject>
                   <phrase>Node Types</phrase>
                </textobject>
             </inlinemediaobject> in the toolbar; a list of available nodes for PDT&nbsp;3.0 is displayed:
    <figure id="fig-screenshot-web-lindat-pdt30-nodetypes">
      <title>A part of the list of available node types for PDT&nbsp;3.0</title>

      <mediaobject>
        <imageobject role="html">
          <imagedata scale="&cutshotscale;" align="center" fileref="images/screenshot_web_lindat_pdt30_node_types_menu_cut.png"
                      format="PNG" />
        </imageobject>
      </mediaobject>
    </figure>
      
    Choose <literal>t-node</literal>. The string <literal>t-node</literal> will be copied to the text area below the toolbar.
    </para>
    <para>
      Properties of a node follow its type, enclosed in square brackets: type&nbsp;<literal>[</literal> and choose
      a t-node attribute <literal>functor</literal> 
      from menu&nbsp;<inlinemediaobject>
                <imageobject role="html">
                   <imagedata contentdepth="20pt"
                      fileref="images/callouts/toolbar-Attributes.png" format="PNG" />
                </imageobject>
                <textobject>
                   <phrase>Attributes</phrase>
                </textobject>
                </inlinemediaobject> in the toolbar. Next, select operator <literal>=</literal> from the <literal>Comparison</literal> group
              in the&nbsp;<inlinemediaobject>
                <imageobject role="html">
                   <imagedata contentdepth="20pt"
                      fileref="images/callouts/toolbar-Operators.png" format="PNG" />
                </imageobject>
                <textobject>
                   <phrase>Operators</phrase>
                </textobject>
             </inlinemediaobject> menu in the toolbar, and type <literal>"PRED"</literal>. Finish by closing the definition of the t-node by&nbsp;<literal>]</literal>.
    <xref linkend="fig-screenshot-web-lindat-pdt30-query-PRED"/> shows how the query should look like (the spaces are optional).
    <figure id="fig-screenshot-web-lindat-pdt30-query-PRED">
      <title>A simple query searching for Predicates in PDT&nbsp;3.0</title>

      <mediaobject>
        <imageobject role="html">
          <imagedata scale="&cutshotscale;" align="center" fileref="images/screenshot_web_lindat_pdt30_query_PRED_cut.png"
                      format="PNG" />
        </imageobject>
      </mediaobject>
    </figure>
  </para>
</listitem>

        <listitem>
          <para>Method 2: In the query text area, start typing <literal>t-</literal>. The popup menu with possible node types will be offered:
    <figure id="fig-screenshot-web-lindat-pdt30-node-type-hints-t-layer-cut">
      <title>List of available node types for PDT&nbsp;3.0 containing the string <literal>t-</literal></title>

      <mediaobject>
        <imageobject role="html">
          <imagedata scale="&cutshotscale;" align="center" fileref="images/screenshot_web_lindat_pdt30_node_type_hints_t-layer_cut.png"
                      format="PNG" />
        </imageobject>
      </mediaobject>
    </figure>

    Choose <literal>t-node</literal> and continue typing the query, i.e. <literal>[ fu</literal>. After you start typing the name of the attribute,
    another popup window with possible attributes is offered:
    <figure id="fig-screenshot-web-lindat-pdt30-attribute-hints-functor-cut">
      <title>List of available attribute names in PDT&nbsp;3.0 containing the string <literal>fu</literal></title>

      <mediaobject>
        <imageobject role="html">
          <imagedata scale="&cutshotscale;" align="center" fileref="images/screenshot_web_lindat_pdt30_attribute_hints_functor_cut.png"
                      format="PNG" />
        </imageobject>
      </mediaobject>
    </figure>
    
    Choose <literal>functor</literal> and finish typing the rest of the query, i.e. <literal>="functor"]</literal>.
    <para>
    The resulting query should be the same as in <xref linkend="fig-screenshot-web-lindat-pdt30-query-PRED"/> (again, the spaces are optional), i.e.:
     <programlisting>t-node [ functor="PRED" ]</programlisting>
     <keysym><ulink url="http://hdl.handle.net/11346/PMLTQ-KVJI">try the query</ulink></keysym></para>
  </para>
        </listitem>
        
      </itemizedlist>

       <note>
        <para>Throughout the tutorial, you can use the button <keysym>try the query</keysym> placed
          below examples to go directly to the web client and try the example. Such permanent links
          to queries in the web client can be created by clicking on <inlinemediaobject>
                <imageobject role="html">
                   <imagedata contentdepth="20pt"
                      fileref="images/callouts/PermanentLink.png" format="PNG" />
                </imageobject>
                <textobject>
                   <phrase>Permanent Link</phrase>
                </textobject>
                </inlinemediaobject> on the right side below the query text area.</para>
      </note>
    </section>      
      
      <section>
        <title>Executing the query</title>
        <para>
          To execute the query, press&nbsp;&nbsp;<inlinemediaobject>
                <imageobject role="html">
                   <imagedata contentdepth="20pt"
                      fileref="images/callouts/ExecuteQuery.png" format="PNG" />
                </imageobject>
                <textobject>
                   <phrase>Execute Query</phrase>
                </textobject>
                </inlinemediaobject> below the query text area. The query gets processed by the server and the result
              is displayed. <xref linkend="fig-screenshot-web-lindat-pdt30-query-PRED"/> shows the first matching tree.
    <figure id="fig-screenshot-web-lindat-pdt30-query-PRED-result">
      <title>A result tree for the query searching for Predicates in PDT&nbsp;3.0</title>

      <mediaobject>
        <imageobject role="html">
          <imagedata width="&screenshotwidth;%" scalefit="1" align="center" fileref="images/screenshot_web_lindat_pdt30_query_PRED_result.png"
                      format="PNG" />
        </imageobject>
      </mediaobject>
    </figure>