Can I make text of an element (complexType and mixed) mandatory through XSD and one attribute mandatory based on enumeration

I have this XML

<button onclick="alert('submit')" replace="append" forid="loginbutton" id="btnLogin" >Click Me<开发者_Python百科;/button>

And I have this XSD

  <xs:element name="button" >
    <xs:complexType mixed="true">
                <xs:attribute name="forid" use="required" type="xs:string" />
                <xs:attribute name="onclick" use="required" />
                <xs:attribute name="id" use="optional" />
                <xs:attribute name="replace" use="required">
                    <xs:simpleType>
                        <xs:restriction base="xs:string">
                            <xs:enumeration value="modify" />
                            <xs:enumeration value="append" />
                        </xs:restriction>
                    </xs:simpleType>
                </xs:attribute>
    </xs:complexType>
  </xs:element>

I want two things here

1. The button content text should be mandatory in all cases
2. If the value of replace attribute is 'append' then attribute id will be mandatory

---

If you make this a complex-type-with-simple-content, then you can constrain the permitted values of the text using xs:enumeration. If you make it a complex-type-with-mixed-content, then you can't constrain what goes in the text. It seems to me you want simple content here, not mixed content (there are no child elements).

You can't define a co-constraint (values of one thing dependent on the values of another) using XSD 1.0 - for that you need XSD 1.1. Support for XSD 1.1 is currently available only in Saxon and Xerces.

---

I managed to get it done somehow. I quite did not understand it, basically I just did trial and error. If someone can explain what this means I will be grateful.

<xs:element name="button">
    <xs:complexType>
        <xs:simpleContent>
            <xs:restriction base="xs:anyType">
                <xs:simpleType>
                    <xs:restriction base="xs:string">
                        <xs:minLength value="1" />

                    </xs:restriction>
                </xs:simpleType>
                <xs:attribute name="forid" use="required" type="xs:string" />
                <xs:attribute name="onclick" />
                <xs:attribute name="id" use="optional" />
                <xs:attribute name="type" use="required" />
                <xs:attribute name="replace" use="required">
                    <xs:simpleType>
                        <xs:restriction base="xs:string">
                            <xs:enumeration value="modify" />
                            <xs:enumeration value="append" />
                        </xs:restriction>
                    </xs:simpleType>
                </xs:attribute>

            </xs:restriction>
        </xs:simpleContent>
    </xs:complexType>
</xs:element>