Error: Element 'assert' Is Invalid, Misplaced, Or Occurs Too Often

Question

I have tried assert in XSD and I get the error

Element 'assert' Is Invalid, Misplaced, Or Occurs Too Often.

My example is the below XML.

`<?xml version="1.0" encoding="utf-8"?>
<p:CustomerElement xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <recordCount>1234</recordCount>
  <Customer>
      <indicator>A</indicator>
      <test1>hdjfs</test1>
      <test2>idsfh</test2>
	  <test3>idsfh</test3>
	  <test4>idsfh</test4>
	  <test5>idsfh</test5>
	  <test6>idsfh</test6>
	  <test7>idsfh</test7>
	</Customer>
    <Customer>
      <indicator>D</indicator>
      <test1>abcd</test1>
	  <test3>jhf</test3>
    </Customer>
</p:CustomerElement>`

The XSD that I created for this is

<?xml version="1.0" encoding="utf-8"?>
<xs:schema elementFormDefault="qualified" 
           xmlns:xs="http://www.w3.org/2001/XMLSchema" 
           xmlns="http://My.Schema.Namespace" 
           targetNamespace="http://My.Schema.Namespace"
		   xmlns:vc="http://www.w3.org/2007/XMLSchema-versioning"
           elementFormDefault="qualified"
           vc:minVersion="1.1">>

  <xs:element name="customer">
    <xs:complexType>
	<xs:sequence>
      <xs:element name="indicator">
	<xs:simpleType>
          <xs:restriction base="xs:string">
            <xs:enumeration value="A" />
            <xs:enumeration value="B" />
          </xs:restriction>
    </xs:simpleType>
	  </xs:element>
      <xs:choice>
        <xs:element name="test1" />
        <xs:element name="test2" />
		<xs:element name="test3" />
		<xs:element name="test4" />
		<xs:element name="test5" />
		<xs:element name="test6" />
		<xs:element name="test7" />
      </xs:choice>
	  </xs:sequence>
    <xs:assert test="if(indicator eq 'A') then test1 and test2 and test3 and test4 
						and test5 and test6 and test7
						else if(indicator eq 'B') then test1 and test3"/>
	</xs:complexType>
  </xs:element>
 </xs:schema>

I am validating this above xml with XSD in freeformat validator.

There are few errors in the syntax of assert i guess. Can anyone please help on the condition i was looking for and help me also on syntax and also let me know if i have added the correct links that support XSD 1.1 schema.

Answer 1

To resolve the problems with your XSD:

1. Change

      elementFormDefault="qualified"
      vc:minVersion="1.1">>
   

   to

      vc:minVersion="1.1">
   

   to eliminate the spurious > and the duplicated elementFormDefault attribute.

2. Add an else false() to your assertion test so that it is well-formed. Better yet, re-write to the logical equivalent without the compound if-else construction.

3. Use an XSD 1.1 processor if you wish to use xs:assert. Freeformat.com only supports XSD 1.0.

Well-formed XSD

<?xml version="1.0" encoding="utf-8"?>
<xs:schema elementFormDefault="qualified" 
  xmlns:xs="http://www.w3.org/2001/XMLSchema" 
  xmlns="http://My.Schema.Namespace" 
  targetNamespace="http://My.Schema.Namespace"
  xmlns:vc="http://www.w3.org/2007/XMLSchema-versioning"
  vc:minVersion="1.1">

  <xs:element name="customer">
    <xs:complexType>
      <xs:sequence>
        <xs:element name="indicator">
          <xs:simpleType>
            <xs:restriction base="xs:string">
              <xs:enumeration value="A" />
              <xs:enumeration value="B" />
            </xs:restriction>
          </xs:simpleType>
        </xs:element>
        <xs:choice>
          <xs:element name="test1" />
          <xs:element name="test2" />
          <xs:element name="test3" />
          <xs:element name="test4" />
          <xs:element name="test5" />
          <xs:element name="test6" />
          <xs:element name="test7" />
        </xs:choice>
      </xs:sequence>
      <xs:assert test="if (indicator eq 'A') 
        then test1 and test2 and test3 and test4 and test5 and test6 and test7
        else if (indicator eq 'B') then test1 and test3 else false()"/>
    </xs:complexType>
  </xs:element>
</xs:schema>

Achieving validity of your XML against this XSD is left as an exercise for the asker to complete, assuming the above obstacles can be overcome.