Validating unordered elements with additional requirements

[SwimsZoots]

Hi,

I have to validate an XML document where there is a parent element <Output>, which, if present must have one or both of the following child elements: <errors>, <mappings>. (max. 1 instance each, unordered).

Any ideas on what as possible schema would look like, if it is possible at all?

tia,
bob

[Radu]

Hello

Maybe try would work:

Code: Select all

<?xml version="1.0" encoding="UTF-8"?>

<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified" attributeFormDefault="unqualified">

    <xs:element name="output">

        <xs:complexType>

            <xs:choice>

                <xs:sequence>

                    <xs:element ref="errors" minOccurs="1" maxOccurs="1"/>

                    <xs:element ref="mappings" minOccurs="0" maxOccurs="1"/>

                </xs:sequence>

                <xs:sequence>

                    <xs:element ref="mappings" minOccurs="1" maxOccurs="1"/>

                    <xs:element ref="errors" minOccurs="0" maxOccurs="1"/>

                </xs:sequence>

            </xs:choice>

        </xs:complexType>

    </xs:element>

    <xs:element name="errors"/>

    <xs:element name="mappings"/>

</xs:schema>

[SwimsZoots]

Thanks a bunch. This helps a lot. Plus it gives me some ideas for other things I need to do.