Description:
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Documentation at http://php.net/manual/en/domdocument.schemavalidate.php is missing a code example. I would suggest to add an example from the php-src repository:

----------shipping.xml----------
<?xml version="1.0"?>
<shipOrder>
  <shipTo>
    <name>Tove Svendson</name>
    <street>Ragnhildvei 2</street>
    <address>4000 Stavanger</address>
    <country>Norway</country>
  </shipTo>
  <items>
    <item>
      <title>Empire Burlesque</title>
      <quantity>1</quantity>
      <price>10.90</price>
    </item>
    <item>
      <title>Hide your heart</title>
      <quantity>1</quantity>
      <price>9.90</price>
    </item>
  </items>
</shipOrder>
----------shipping.xml----------


----------shipping.xsd----------
<?xml version="1.0"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"> 

    <xsd:element       name="shipOrder" type="order"/> 
    
    <xsd:complexType   name="order">
        <xsd:all>
            <xsd:element   name="shipTo"    type="shipAddress"/>
            <xsd:element   name="items"     type="cdItems"/>
        </xsd:all>
    </xsd:complexType> 
    
    <xsd:complexType   name="shipAddress">
        <xsd:all>
            <xsd:element   name="name"      type="xsd:string"/>
            <xsd:element   name="street"    type="xsd:string"/>
            <xsd:element   name="address"   type="xsd:string"/>
            <xsd:element   name="country"   type="xsd:string"/>
        </xsd:all>
    </xsd:complexType> 
    
    <xsd:complexType   name="cdItems">
        <xsd:sequence>
            <xsd:element   name="item"      type="cdItem"  maxOccurs="unbounded" minOccurs="1"/>
        </xsd:sequence>
    </xsd:complexType> 
    
    <xsd:complexType   name="cdItem">
        <xsd:all>
            <xsd:element   name="title"     type="xsd:string"/>
            <xsd:element   name="quantity"  type="xsd:positiveInteger"/>
            <xsd:element   name="price"     type="xsd:decimal"/>
        </xsd:all>
    </xsd:complexType> 

</xsd:schema>
----------shipping.xsd----------


----------shipping.php----------
<?php

$dom = new domDocument;
$dom->load('shipping.xml');
if (!$dom->schemaValidate('shipping.xsd')) {
  print "Document is not valid";
} else {
  print "Document is valid";
}
----------shipping.php----------