На каком этапе проверяется свойство ACCESS_EXTERNAL_SCHEMA

Question

Я смотрю на два атрибута XML - XMLConstants.ACCESS_EXTERNAL_DTD и XMLConstants.ACCESS_EXTERNAL_SCHEMA.

Я могу подтвердить это при загрузке external_dtd. xml file.

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE note SYSTEM "http://www.example.com/test.dtd">
<root>
</root>

unit test завершается неудачно, как ожидалось

@Test
public void testExternalDTD() throws Exception {
    DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance();
    documentBuilderFactory.setFeature(XMLConstants.FEATURE_SECURE_PROCESSING, true);
    documentBuilderFactory.setAttribute(XMLConstants.ACCESS_EXTERNAL_DTD, "");

    DocumentBuilder documentBuilder = documentBuilderFactory.newDocumentBuilder();
    documentBuilder.parse(SchemaTest.class.getResourceAsStream("external_dtd.xml"));
    // [Fatal Error] :2:57: External DTD: Failed to read external DTD 'test.dtd', because 'http' access is not allowed due to restriction set by the accessExternalDTD property.
}

Однако я не уверен, на каком этапе XMLConstants.ACCESS_EXTERNAL_SCHEMA используется

<?xml version="1.0" encoding="UTF-8"?>
<root xmlns="http://www.example.com/Report" xmlns:xsi = "http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.example.com/Report  http://maven.apache.org/maven-v4_0_0.xsd">
</root>

как загрузка external_dtd. xml успешно.

 @Test
 public void testExternalSchema() throws Exception {
     DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance();
     documentBuilderFactory.setFeature(XMLConstants.FEATURE_SECURE_PROCESSING, true);
     documentBuilderFactory.setAttribute(XMLConstants.ACCESS_EXTERNAL_SCHEMA, "");

     DocumentBuilder documentBuilder = documentBuilderFactory.newDocumentBuilder();
     documentBuilder.parse(SchemaTest.class.getResourceAsStream("external_schema.xml"));
 }

Как использовать XMLConstants.ACCESS_EXTERNAL_SCHEMA?