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      <a href="d_start2.html">Chapter 1: Getting Started with Stylus Studio®</a>
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      <a href="d_edit.html">Chapter 2: Editing and Querying XML</a>
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      <a href="d_flatfileconversion.html">Chapter 3: Converting Non-XML Files to XML</a>
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      <a href="d_xslt.html">Chapter 4: Working with XSLT</a>
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      <a href="d_xslt_xmlxml.html">Chapter 5: Creating XSLT Using the XSLT Mapper</a>
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      <a href="d_java.html">Chapter 6: Debugging Stylesheets</a>
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      <a href="d_schema.html">Chapter 7: Defining XML Schemas</a>
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      <a href="d_dtd.html">Chapter 8: Defining Document Type Definitions</a>
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      <a href="d_xpath.html">Chapter 9: Writing XPath Expressions</a>
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        <a href="d_xpath2.html#wp204661">About the XPath Processor</a>
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            <a href="d_xpath3.html#wp1088488">Where You Can Use XPath Expressions</a>
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            <a href="d_xpath4.html#wp205792">About XPath</a>
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            <a href="d_xpath5.html#wp203656">Benefits of XPath</a>
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        <a href="d_xpath8.html#wp1719426">Using the XPath Query Editor</a>
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        <a href="d_xpath14.html#wp204784">Sample Data for Examples and Practice</a>
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        <a href="d_xpath19.html#wp231713">Getting Started with Queries</a>
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        <a href="d_xpath32.html#wp1541658">Specifying the Nodes to Evaluate</a>
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        <a href="d_xpath51.html#wp337132">Specifying Number Operations and Functions</a>
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        <a href="d_xpath54.html#wp313717">Comparing Values</a>
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        <a href="d_xpath63.html#wp219142">Finding a Particular Node</a>
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        <a href="d_xpath73.html#wp203979">Obtaining a Union</a>
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        <a href="d_xpath74.html#wp960970">Obtaining Information About a Node or a Node Set</a>
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        <a href="d_xpath80.html#wp917039">Using XPath Expressions in Stylesheets</a>
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        <a href="d_xpath87.html#wp426747">Accessing Other Documents During Query Execution</a>
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        <a href="d_xpath92.html#wp919260">XPath Quick Reference</a>
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      <a href="d_webservices.html">Chapter 11: Composing Web Service Calls</a>
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      <a href="d_rdb.html">Chapter 12: Accessing Relational Data as XML</a>
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      <a href="d_pipeline.html">Chapter 13: Building XML Pipelines</a>
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      <a href="d_publisher.html">Chapter 14: Publishing XML Data</a>
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Restrictions on Queries

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XPath is a language for selecting existing XML data; it does not perform manipulation (like sorting) or construction of different XML structures. To perform such operations, you need to use the language that is hosting XPath - XSLT or XQuery, for example.

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You cannot query non-XML data. If you query a document that does not contain XML-formatted data, Stylus Studio displays an error message that informs you that the queried text is not XML.

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