PHP | XMLReader setRelaxNGSchemaSource() Function

The XMLReader::setRelaxNGSchemaSource() function is an inbuilt function in PHP which is used to set the data containing a RelaxNG Schema to use for validation. The setRelaxNGSchemaSource() function is different from setRelaxNGSchema() function as the former accepts the rule as a string variable whereas later function accepts the rule as a .rng file.

Syntax:

bool XMLReader::setRelaxNGSchemaSource( string $source )

Parameters: This function accepts a single parameter $source which holds the string containing the RelaxNG Schema.

Return Value: This function returns TRUE on success or FALSE on failure.

Below examples illustrate the XMLReader::setRelaxNGSchemaSource() function in PHP:



Example 1:

  • data.xml
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    <?xml version="1.0"?>
    <body>
        <div>
            <h1>GeeksForGeeks</h1>
            <p>Portal for Geeks</p>
        </div>
        <div>
            <h1>Heading 3</h1>
            <p>Heading 4</p>
        </div>
    </body>

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  • index.php
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    <?php
      
    // Create a new XMLReader instance
    $XMLReader = new XMLReader();
      
    // Open the XML file
    $XMLReader->open('data.xml');
      
    // Create rule as a string
    $RNG = "<element name=\"body\"
    xmlns=\"http://relaxng.org/ns/structure/1.0\">
    <zeroOrMore>
      <element name=\"div\">
        <element name=\"h1\">
          <text/>
        </element>
        <element name=\"p\">
          <text/>
        </element>
      </element>
    </zeroOrMore>
    </element>";
      
    // Load the rule
    $XMLReader->setRelaxNGSchemaSource($RNG);
      
    // Iterate through the XML nodes
    while ($XMLReader->read()) {
        if ($XMLReader->nodeType == XMLREADER::ELEMENT) {
      
            // Check if XML follows the relaxNG rule
            if ($XMLReader->isValid()) {
                echo "This document is valid!<br>";
            }
      
        }
    }
    ?>

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  • Output:
    This document is valid!
    This document is valid!
    This document is valid!
    This document is valid!
    This document is valid!
    This document is valid!
    This document is valid!

Example 2:

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    <?xml version="1.0"?>
    <body>
        <div>
            <!--Create empty div element
               to violate rule-->
        </div>
        <div>
            <h1>Heading 3</h1>
            <h2>Heading 4</h2>
        </div>
    </body>

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  • index.php
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    <?php
      
    // Create a new XMLReader instance
    $XMLReader = new XMLReader();
      
    // Open the XML file
    $XMLReader->open('data.xml');
      
    // Create rule as a string
    $RNG = "<element name=\"body\"
    xmlns=\"http://relaxng.org/ns/structure/1.0\">
    <zeroOrMore>
      <element name=\"div\">
        <element name=\"h1\">
          <text/>
        </element>
        <element name=\"h2\">
          <text/>
        </element>
      </element>
    </zeroOrMore>
    </element>";
      
    // Load the rule
    $XMLReader->setRelaxNGSchemaSource($RNG);
      
    // Iterate through the XML nodes
    while ($XMLReader->read()) {
        if ($XMLReader->nodeType == XMLREADER::ELEMENT) {
      
            // Check if XML follows the relaxNG rule
            if (!$XMLReader->isValid()) {
                echo "This document is not valid!<br>";
            }
      
        }
    }
    ?>

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  • Output:
    This document is not valid!
    This document is not valid!
    This document is not valid!

Reference: https://www.php.net/manual/en/xmlreader.setrelaxngschemasource.php




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