XML Schema for a mixed content complexType containing non-empty strings and elements

2
votes

I'm trying to create an XML Schema to validate the following xml structure.

<ul>
    <li>123
        <ul>
            <li>A</li>
            <li>B</li>
            <li>C</li>
        </ul>
    </li>  
</ul>

I would like it to fail if the "123" text content is missing or is only white space.

The following schema is as far as I have got. It insists on exactly 3 non-empty list elements. 

<xs:schema attributeFormDefault="unqualified" elementFormDefault="qualified" xmlns:xs="http://www.w3.org/2001/XMLSchema">
  <xs:element name="ul">
    <xs:complexType>
      <xs:sequence>
        <xs:element name="li">
          <xs:complexType mixed="true">
            <xs:sequence>
              <xs:element name="ul">
                <xs:complexType>
                  <xs:sequence>
                    <xs:element type="nonEmptyString" name="li" maxOccurs="3" minOccurs="3" />
                  </xs:sequence>
                </xs:complexType>
              </xs:element>
            </xs:sequence>
          </xs:complexType>
        </xs:element>
      </xs:sequence>
    </xs:complexType>
  </xs:element>
  <xs:simpleType name="nonEmptyString">
        <xs:restriction base="xs:string">
            <xs:minLength value="1"/>
            <xs:pattern value="(\s*[^\s]\s*)+"></xs:pattern>
        </xs:restriction>
  </xs:simpleType>    
</xs:schema>

I'm guessing from In XML Schema, can mixed content restrict the type of the text? that this probably isn't possible but I thought I would ask anyway in case there was a workaround.

1
xmlxsdxsd-validation

1 Answers

2
votes

If you want only letters lower or upper case change 

<xs:pattern value="(\s*[^\s]\s*)+"></xs:pattern>

in 

<xs:pattern value="([a-zA-Z]*)"/>