Question

Can I somehow allow html tags (or other than ‘my:’-namespaced) inside the ‘template’ tag?

<?xml version="1.0"?>
<my:template xmlns:my="http://my.example.com">

  <my:aa/>

  <my:aa>
    <b>stuff</b>
    <my:aa/>
  </my:aa>

  <my:bb/>
</my:template>

Now my schema looks like this

<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
        xmlns="http://my.example.com"
        xmlns:my="http://my.example.com"
        targetNamespace="http://my.example.com"
        elementFormDefault="qualified"
        attributeFormDefault="unqualified">

<xs:complexType name="MyContent">
  <xs:choice minOccurs="0" maxOccurs="unbounded">
    <xs:element name="aa" type="MyContent"/>
    <xs:element name="bb" type="MyContent"/>
  </xs:choice>
</xs:complexType>

<xs:element name="template" type="MyContent"/>

</xs:schema>

xmllint shows up error

kk.xml:7: element b: Schemas validity error : Element 'b': This element is not expected. Expected is one of ( {http://my.example.com}aa, {http://my.example.com}bb ).
kk.xml fails to validate

Answer 1

You can reference any element or complexType from another schema as long as

1. They are globally defined
2. You import/include those schemas/xsd
3. You reference then using correct namespace (targetNamespace)

If you want to use html then you really need to use xhtml. Find namespace details here http://www.w3.org/1999/xhtml/

import tutorial

xsd:import tutorial