[XERCESJ-1746] improvements to error messages, while validating with XML Schema simple types

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 2.12.2
• Component/s: XML Schema 1.0 Structures, XML Schema 1.1 Structures
• Assignee: Mukul Gandhi
• Reporter: Mukul Gandhi
• Created: 02/Jun/22 15:45
• Updated: 02/Jun/22 16:43
• Resolved: 02/Jun/22 15:49

Description

Please consider the following XML Schema validation examples.

XML instance document,

<?xml version="1.0"?>
<X>
<abc/>
</X>

XML Schema 1.0/1.1 document, that validates above mentioned XML instance document,

<?xml version="1.0"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">

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

</xs:schema>

Currently, the above mentioned XML Schema validation produces error messages like following,

[Error] test.xml:4:5: cvc-type.3.1.2: Element 'X' is a simple type, so it must have no element information item [children].
[Error] test.xml:4:5: cvc-datatype-valid.1.2.1: '' is not a valid value for 'integer'.
[Error] test.xml:4:5: cvc-type.3.1.3: The value '' of element 'X' is not valid.

I propose, the following error message instead, for the above mentioned XML Schema validation (the 2nd and 3rd error messages above, doesn't seem to be accurate),

[Error] test.xml:4:5: cvc-type.3.1.2: Element 'X' has the simple type 'integer', so it must have no element information item [children].

Below is another, XML Schema (1.1) document, that validates the above mentioned XML instance document,

<?xml version="1.0"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">

<xs:element name="X">
<xs:alternative test="xs:boolean('false')" type="xs:integer"/>
<xs:alternative type="xs:error"/>
</xs:element>

</xs:schema>

Currently, the above mentioned XML Schema validation produces error messages like following,

[Error] test.xml:4:5: cvc-type.3.1.2: Element 'X' is a simple type, so it must have no element information item [children].
[Error] test.xml:4:5: cvc-datatype-valid.1.2.1: '' is not a valid value for 'error'.
[Error] test.xml:4:5: cvc-type.3.1.3: The value '' of element 'X' is not valid.

I propose, the following error message instead, for the above mentioned XML Schema validation (the 2nd and 3rd error messages above, doesn't seem to be accurate),

[Error] test.xml:4:5: cvc-type.3.1.2: Element 'X' has the simple type 'error', so it must have no element information item [children].