- var_dump: documentation ( source)
<?php
$schema = <<<SCHEMA
<?xml version="1.0" encoding="utf-8"?>
<xs:schema id="vnd.autotrack.supplier.car.request" xmlns:xs="http://www.w3.org/2001/XMLSchema" version="0.3">
<xs:element name="aanbieder_vraag" >
<xs:complexType>
<xs:sequence>
<xs:element name="auto_id" minOccurs="1" maxOccurs="1">
<xs:simpleType>
<xs:restriction base="xs:integer">
<xs:minInclusive value="0" />
<xs:maxInclusive value="9999999999" />
</xs:restriction>
</xs:simpleType>
</xs:element>
<xs:element name="aanbieder_id" minOccurs="1" maxOccurs="1">
<xs:simpleType>
<xs:restriction base="xs:integer">
<xs:minInclusive value="0" />
<xs:maxInclusive value="9999999999" />
</xs:restriction>
</xs:simpleType>
</xs:element>
<xs:element name="email" minOccurs="1" maxOccurs="1">
<xs:simpleType>
<xs:restriction base="xs:string">
<xs:maxLength value="80" />
</xs:restriction>
</xs:simpleType>
</xs:element>
<xs:element name="stuur_kopie" minOccurs="1" maxOccurs="1">
<xs:simpleType>
<xs:restriction base="xs:string">
<xs:enumeration value="J"/>
<xs:enumeration value="N"/>
</xs:restriction>
</xs:simpleType>
</xs:element>
<xs:element name="soort_aanvraag" minOccurs="1" maxOccurs="1">
<xs:simpleType>
<xs:restriction base="xs:string">
<xs:enumeration value="P"/>
<xs:enumeration value="V"/>
</xs:restriction>
</xs:simpleType>
</xs:element>
<xs:element name="telefoon" nillable="true" minOccurs="0" maxOccurs="1">
<xs:simpleType>
<xs:restriction base="xs:string">
<xs:minLength value="10" />
<xs:maxLength value="10" />
</xs:restriction>
</xs:simpleType>
</xs:element>
<xs:element name="datum" nillable="true" minOccurs="0" maxOccurs="1">
<xs:simpleType>
<xs:restriction base="xs:date" />
</xs:simpleType>
</xs:element>
<xs:element name="vragen" minOccurs="0" maxOccurs="1">
<xs:simpleType>
<xs:restriction base="xs:string">
<xs:maxLength value="1000" />
</xs:restriction>
</xs:simpleType>
</xs:element>
<xs:element name="locale" minOccurs="0" maxOccurs="1" default="nl_NL">
<xs:simpleType>
<xs:restriction base="xs:string">
<xs:enumeration value="nl_NL"/>
<xs:enumeration value="nl_BE"/>
<xs:enumeration value="fr_BE"/>
</xs:restriction>
</xs:simpleType>
<xs:attribute name="is-foo" type="xs:boolean" default="true" use="optional" />
</xs:element>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:schema>
SCHEMA;
$xml = <<<XML
<?xml version="1.0"?>
<aanbieder_vraag><auto_id>7493124</auto_id><aanbieder_id>40284</aanbieder_id><email>nbelhomme@enrise.com</email><stuur_kopie>J</stuur_kopie><soort_aanvraag>V</soort_aanvraag><vragen>blabla</vragen></aanbieder_vraag>
XML;
$document = new DOMDocument();
$document->loadXML($xml);
$document->schemaValidateSource($schema, LIBXML_SCHEMA_CREATE);
$document->resolveExternals = true;
$document->substituteEntities = true;
var_dump($document->getElementsByTagName('locale'));