A brief introduction to the elementFormDefault attribute in XML Schema

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elementFormDefault attribute is related to namespace, its value can be set to qualified or unqualified

If set to qualified:

When using local elements in XML documents, you must use a qualified short name as a prefix

##sean.xsd:

<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
 xmlns:sean="http://sean.com"
 targetNamespace="http://sean.com"
 elementFormDefault="qualified">
 <xs:element name="book_list">
 <xs:complexType>
 <xs:sequence>
 <xs:element name="book" type="xs:string"/>
 </xs:sequence>
 </xs:complexType>
 </xs:element>
</xs:schema>

sean.xml:

<?xml version="1.0" encoding="UTF-8"?>
<sean:book_list xmlns:sean="http://sean.com" 
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
 xsi:schemaLocation="http://sean.com sean.xsd">
 <sean:book>test</sean:book>
</sean:book_list>

If set to unqualified:

When using local elements in XML documents, the qualified short can be omitted Name

sean.xsd：

<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
 xmlns:sean="http://sean.com"
 targetNamespace="http://sean.com"
 elementFormDefault="unqualified">
 <xs:element name="book_list">
 <xs:complexType>
 <xs:sequence>
 <xs:element name="book" type="xs:string"/>
 </xs:sequence>
 </xs:complexType>
 </xs:element>
</xs:schema>

sean.xml：

<?xml version="1.0" encoding="UTF-8"?>
<sean:book_list xmlns:sean="http://sean.com" 
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
 xsi:schemaLocation="http://sean.com sean.xsd">
 <book>test</book>
</sean:book_list>

Although there will be a lot of indirection, it is not easy to understand because the namespace is removed.

Similar attributes include attributeFormDefault, whose rules are the same as elementFormDefault

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