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            <a href="d_xpath3.html#wp1304056">A Sample XML Document</a>
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        <a href="d_xpath4.html#wp231713">Getting Started with Queries</a>
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Sample Data for Examples and Testing

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The best way to learn how to query data is to practice using queries. To prepare you for testing queries, this section provides a review of the basic structure of an XML document. An understanding of this structure is crucial to defining queries that return the data you want. Following the review, this section includes the XML data on which the query examples operate. The last part of this section provides instructions for running queries on sample data.

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The topics in this section include

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          <a shape="rect" href="d_xpath3.html#wp231687">About XML Document Structure</a>
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          <a shape="rect" href="d_xpath3.html#wp1304056">A Sample XML Document</a>
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          <a shape="rect" href="d_xpath3.html#wp204825">Tree Representation of a Sample XML Document</a>
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        <li>
          <a shape="rect" href="d_xpath3.html#wp206969">Steps for Trying the Sample Queries</a>
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About XML Document Structure

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The XPath processor operates on a tree representation of XML data that looks like the following figure:
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The root node has no actual text associated with it. You can think of the file name as the root node. A document can include zero or more comments and zero or more processing instructions. 

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A document element is required, and there can be only one. The document element contains all elements in the document. For example: 
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In the preceding figure, 
    <code class="cCode">bookstore.xml</code> is the name of a file that contains XML data. There is a comment near the beginning of the document that starts with
    <code class="cCode"> "This file represents a ..."</code> The document element is 
    <code class="cCode">bookstore</code>. The immediate children of 
    <code class="cCode">bookstore</code> include an attribute, a namespace declaration (not supported by Stylus Studio), three 
    <code class="cCode">book</code> elements (one is in the 
    <code class="cCode">my</code> namespace), and a 
    <code class="cCode">magazine</code> element. The 
    <code class="cCode">book</code> and 
    <code class="cCode">magazine</code> elements contain elements and attributes, which are shown in the
    <a shape="rect" href="d_xpath3.html#wp1327275"> figure </a>that appears in 
    <a shape="rect" href="d_xpath3.html#wp204825">Tree Representation of a Sample XML Document</a>. 

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A Sample XML Document

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The examples in this section are based on the following XML data. This data is in the 
    <code class="cCode">bookstore.xml</code> file, which is in the 
    <code class="cCode">examples</code> directory of your installation directory. 

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Tree Representation of a Sample XML Document

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When you query a document, it can be helpful to think of a tree representation of your data. A tree that represents the 
    <code class="cCode">bookstore.xml </code>document appears in 
    <a shape="rect" href="d_xpath3.html#wp1491676">Figure&#160;269</a> (and is continued in 
    <a shape="rect" href="d_xpath3.html#wp1327296">Figure&#160;270</a>). To use Stylus Studio to view a similar tree for any XML document, open the XML document in Stylus Studio and select the
    <b class="cBold"> Tree</b> tab. 
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Figure&#160;269. Tree Display of an XML Document

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Figure&#160;270. Tree Display of an XML Document (continued)

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Steps for Trying the Sample Queries

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To try the queries in this section, or any other queries you want to run on the 
    <code class="cCode">bookstore.xml</code> document, follow these instructions:

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	1.	In Stylus Studio, open 
    <code class="cCode">bookstore.xml</code>. You can find it in the 
    <code class="cCode">examples</code> directory of your installation directory. 

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	2.	At the top of the window that contains 
    <code class="cCode">bookstore.xml</code>, highlight 
    <b class="cBold">&lt;Type a new query&gt;</b>.

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	3.	Type a query. For example: /bookstore/book/author. 

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	4.	Press Enter or click 
    <b class="cBold">Refresh Query</b> 
    <img src="images/RefreshQueryIcon.gif" height="19" width="18" border="0" hspace="0" vspace="0"/>
 . 

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Stylus Studio displays the results in the 
    <b class="cBold">Query Output </b>window. 

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