make field mandatory depending on values

[mariomueller]

Hi all,

could anybody plaese provide an example, how to make a parent element mandatory if one of its children has a special value?

e.g. how could I make element

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name="book" = minOccurs = 1

if

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name="title"  

would be

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"The Hobbit"

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<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">

  <xsd:element name="catalog">

    <xsd:complexType>

      <xsd:sequence>

        <xsd:element name="book" 

                     minOccurs="0" 

                     maxOccurs="unbounded">

           <xsd:complexType>

              <xsd:sequence>

                 <xsd:element name="author" type="xsd:string"/>

                 <xsd:element name="title" type="xsd:string"/>

                  </xsd:sequence>

               <xsd:attribute name="id" type="xsd:string"/>

          </xsd:complexType>

        </xsd:element>

      </xsd:sequence>

    </xsd:complexType>

  </xsd:element>

</xsd:schema>

Thanks Regards Mario

[adrian]

Hi,

AFAIK, this kind of condition is only possible in XSD 1.1 or XSD 1.0+embedded Schematron.
For XSD 1.1 you can use xsd:assert. You can find a discussion about such condition on stackoverflow, Conditional required elements in an XSD

For embedded Schematron you can use sch:assert. More details and an example can be found in our user guide:
XML Schema or RELAX NG with Embedded Schematron Rules

Regards,
Adrian

[mariomueller]

Hi Adrian,

thanks for your reply. As I am just starting with XSD 1.1 the example you gave is to complicated for me. I didn't get it.

I need a easy example; but I am not sure what words I should take for googeling

Regards
Mario

[mariomueller]

Got it:

Schema:

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

<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:vc="http://www.w3.org/2007/XMLSchema-versioning" elementFormDefault="qualified" attributeFormDefault="unqualified" vc:minVersion="1.1">

	<xs:element name="PRODUCT" type="ProductType"/>

	<xs:complexType name="ProductType">

		<xs:sequence>

			<xs:element name="number" type="xs:integer"/>

			<xs:element name="name" type="xs:string" minOccurs="0"/>

			<xs:element name="size" type="xs:integer" minOccurs="0"/>

		</xs:sequence>

		<xs:attribute name="dept" type="xs:string"/>

		<xs:assert test="if (name/text()='uschi')

                       then not(size)

                       else true()"/>

	</xs:complexType>

</xs:schema>

XML Instance:

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

<!--if element <name> has value 'uschi' , element <size> is not allowed-->

<!-- if element <size> exists, element <name> value 'uschi' is not allowed-->

<PRODUCT xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" dept="XXXXX" xsi:noNamespaceSchemaLocation="XSD_Arbeitsversion.xsd">

	<number>0</number>

	<name>uschi</name>

	<size>0</size>

</PRODUCT>

Regards Mario