Re: minOccurs dependent on other element value / xpath

                                                                                                               
                                                                                                               
                                                                                                               


Sam,

There is no way to do what you seek using only W3C XML Schema Language 1.0.

If you are willing to use a different element name for package when isFinal
is 1 or isFinal is 0, you could do specify this.

If you are willing to use xsi:type="..." on the package element, and have 2
complexTypes, one of which is derived from the other, and one of which
requires at least one <plan> and the other doesn't, then you can do this.

However, both of these proposals require some change to the format of your
instance document.

If you are not interested in a validator enforcing this rule, but simply
want to communicate it to developers who write software that emits or
receives instance documents, you can document this via <xs:annotation><xs:
documentation>...

Bob

Extensible Technologies
IBM Thomas J. Watson Research Center
Yorktown Heights, NY, USA


"Neff, Sam [NEA]" <SNeff@nea.org>@w3.org on 06/25/2002 09:12:50 AM

Sent by:    xmlschema-dev-request@w3.org


To:    <xmlschema-dev@w3.org>
cc:
Subject:    minOccurs dependent on other element value / xpath







Is it possible to specify minOccurs dynamically; dependent on the value of
an element in the schema instance?

For example, if I have two XML documents:

<package>
   <header>
      <name>2001-02 Boise</name>
      <isFinal>1</isFinal>
   </header>
   <plans>
      <plan>some plan</plan>
   </plans>
</package>


And


<package>
   <header>
      <name>2001-02 Boise</name>
      <isFinal>0</isFinal>
   </header>
   <plans/>
</package>


With a corresponding schema:

<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
elementFormDefault="qualified" attributeFormDefault="unqualified">
   <xs:element name="package">
      <xs:complexType>
         <xs:all>
            <xs:element name="header">
               <xs:complexType>
                  <xs:all>
                     <xs:element name="name" type="xs:string"/>
                     <xs:element name="isFinal" type="xs:boolean"/>
                  </xs:all>
               </xs:complexType>
            </xs:element>
            <xs:element name="plans" minOccurs="0">
               <xs:complexType>
                  <xs:sequence>

                     <xs:element
                        name="plan"
                        type="xs:anyType"
                        minOccurs="0"
                        maxOccurs="unbounded"/>

                        <!-- I want minOccurs to be 1 when
                             /package/header/isFinal=1 -->

                  </xs:sequence>
               </xs:complexType>
            </xs:element>
         </xs:all>
      </xs:complexType>
   </xs:element>
</xs:schema>


The minOccurs="0" on element "plan".  In cases where the value of element
"isFinal" (package/header/isFinal) is true, I want minOccurs on "plan" to
be 1.

Is there any way to accomplish this in XML Schema?

Thanks,

Samuel Neff



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