Co-Occurrence Constraint

Question

I am having difficulty writing an XSD I'm working on using XML Schema 1.1.

I have one element named PaymentMethod that is either "C" or "F": If PaymentMethod = "C", then it's a check. If PaymentMethod = "F", then it's a fund transfer.

How do I make BankingInfo (BankName, TransitNo, AccountNo, AccountType) optional for a check and mandatory for a fund transfer?

See below for a snippet of my code.

<xs:element name="PaymentMethod">
  <xs:simpleType>
    <xs:restriction base="xs:string">
      <xs:enumeration value="C" />
      <xs:enumeration value="F" />
    </xs:restriction>
  </xs:simpleType>
</xs:element>

    <xs:complexType name="BankingInfo" minOccurs="0">
      <xs:sequence>
        <xs:element name="TransitNo" type="xs:string" />
        <xs:element name="AccountNo" type="xs:string" />
        <xs:element name="AccountType">
          <xs:simpleType>
            <xs:restriction base="xs:string">
              <xs:enumeration value="CHK" />
              <xs:enumeration value="SAV" />
            </xs:restriction>
          </xs:simpleType>
        </xs:element>
        <xs:element name="BankName" type="xs:string" />
      </xs:sequence>
    </xs:complexType>

@PetruGardea: It is my impression some of the reopen reviewers are not reading all the way to the comments on a question to be reopened. Editing the text with the explicit information about why this is different would have helped as such changes are more prominent for the reviewer. — Anthon, Apr 07 '13 at 15:02
@Anthon, I take your comment at face value, since I really don't know what is the role of a `reopen reviewer` on SO. Initially I checked on meta with regards to comments for reopen, which is where I wanted to put my reasoning - non existing, as explained there... The thing is, there is nothing to add to this question, in my opinion, than what Glenn already put in: he wants an XSD 1.1 solution for co-constraints, period. Linking to an answer that says it is impossible was simply a case of gross misunderstanding. — Petru Gardea, Apr 08 '13 at 17:30
@Glenn How are and elements related? Did you miss adding within ? — IndoKnight, Feb 02 '14 at 12:57

Beth Lang · Answer 1 · 2014-03-20T04:59:11.477

You will need to add an assert at the same level as the BankingInfo node because asserts apply at the same level or lower level but can't navigate up to a parent level. The assert test should check the value of account type as well as ensuring the fields that you want to be "required" actually have values.

Either

<xs:assert test="/root/PaymentMethod eq 'C' or (/root/PaymentMethod eq 'F' and count(/root/BankingInfo) > 0)"/>

Or, if you want some bank info to be required but not all the fields you could do something like this

<xs:assert test="/root/PaymentMethod eq 'C' or (/root/PaymentMethod eq 'F' and string-length(/root/BankingInfo/TransitNo) > 0 and string-length(/root/BankingInfo/AccountNo) > 0)"/>

Both of the above assume some structure similar to the below (the provided sections aren't a complete enough example to put the assert in at the right level)

<?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="root">
    <xs:complexType>
        <xs:sequence>
            <xs:element name="PaymentMethod">
                <xs:simpleType>
                    <xs:restriction base="xs:string">
                        <xs:enumeration value="C"/>
                        <xs:enumeration value="F"/>
                    </xs:restriction>
                </xs:simpleType>
            </xs:element>
            <xs:element name="BankingInfo" minOccurs="0" maxOccurs="1">
                <xs:complexType>
                    <xs:sequence>
                        <xs:element name="TransitNo" type="xs:string"/>
                        <xs:element name="AccountNo" type="xs:string"/>
                        <xs:element name="AccountType">
                            <xs:simpleType>
                                <xs:restriction base="xs:string">
                                    <xs:enumeration value="CHK"/>
                                    <xs:enumeration value="SAV"/>
                                </xs:restriction>
                            </xs:simpleType>
                        </xs:element>
                        <xs:element name="BankName" type="xs:string"/>
                    </xs:sequence>
                </xs:complexType>
            </xs:element>
        </xs:sequence>
        <xs:assert test="/root/PaymentMethod eq 'C' or (/root/PaymentMethod eq 'F' and count(/root/BankingInfo) > 0)"/>
    </xs:complexType>
</xs:element>

Co-Occurrence Constraint

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