Как валидировать XML по XSD?

Free Online XML Validator Against XSD Schema - FreeFormatter.com

XSD Input:

<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" attributeFormDefault="unqualified" elementFormDefault="qualified">
   <xs:element name="zoo">
      <xs:complexType>
         <xs:sequence>
            <xs:element minOccurs="0" name="animals">
               <xs:complexType>
                  <xs:sequence>
                     <xs:choice maxOccurs="unbounded" minOccurs="0">
                        <xs:element name="fox" type="xs:string"/>
                        <xs:element name="wolf" type="xs:string"/>
                        <xs:element name="lion" type="xs:string"/>
                        <xs:element name="bear" type="xs:string"/>
                     </xs:choice>
                  </xs:sequence>
               </xs:complexType>
            </xs:element>
         </xs:sequence>
      </xs:complexType>
   </xs:element>
</xs:schema>

XML Input:

<?xml version="1.0" encoding="UTF-8"?>
<zoo>
   <animals>
      <fox>Eve</fox>
      <wolf>Buffy</wolf>
      <bear>Mario</bear>
      <lion>Ace</lion>
      <bear>Maximus</bear>
   </animals>
</zoo>