This heading explains the working of tasks or instructions that you have just completed.

You will also find some other learning aids in the book, including:

These are short multiple choice questions intended to help you test your own understanding.

Code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles are shown as follows: "We can include other contexts through the use of the include directive."

A block of code is set as follows:

<?xml version="1.0" encoding="UTF-8" ?>
<config>
  <luceneMatchVersion>LUCENE_45</luceneMatchVersion>
  <requestHandler name="standard" class="solr.StandardRequestHandler" default="true" />
  <requestHandler name="/update" class="solr.UpdateRequestHandler" />
  <requestHandler name="/admin/" class="org.apache.solr.handler.admin.AdminHandlers" />
  <admin>
    <defaultQuery>*:*</defaultQuery>
  </admin>
</config>

When we wish to draw your attention to a particular part of a code block, the relevant lines or items are set in bold:

<?xml version="1.0" encoding="UTF-8" ?>
<config>
  <luceneMatchVersion>LUCENE_45</luceneMatchVersion>
  <requestHandler name="standard" class="solr.StandardRequestHandler" default="true" />
  <requestHandler name="/update" class="solr.UpdateRequestHandler" />
	<requestHandler name="/admin/" class="org.apache.solr.handler.admin.AdminHandlers" />	
  <admin>
    <defaultQuery>*:*</defaultQuery>
  </admin>
</config>

Any command-line input or output is written as follows:

cd %SOLR_DIST%example 
java -Dsolr.solr.home=path/to/your/core -jar start.jar

New terms and important words are shown in bold. Words that you see on the screen, in menus or dialog boxes for example, appear in the text like this: "On the Select Destination Location screen, click on Next to accept the default destination."