Re: XML Schema complex type restriction

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From: Mukul Gandhi <gandhi.mukul@g...>
To: Michael Kay <mike@s...>
Date: Mon, 2 Oct 2017 19:01:24 +0530

On 29 September 2017 at 14:09, Michael Kay <mike@s...> wrote:

More realistically, imagine you have a complex type whose content model is <element name="para" minOccurs="0" maxOccurs="unbounded"/>, and the assertion says test="exists(para)", then the assertion on its own would allow

<para/>
<fig/>
<fig/>

which the complex type's grammar does not allow.

Requiring the assertion to be true ONLY for content that satisfies the grammar would be a ridiculous burden on schema authors.

Thanks for sharing this example. In this, the assertion has violated the constraint defined by the grammar. I think, this is an anti-pattern for using an assertion.

Please consider the following example:

XML instance

<?xml version="1.0"?>

<speed>

</speed>

The corresponding XSD 1.1 schema

<?xml version="1.0"?>

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

<xs:element name="speed">

<xs:complexType>

<xs:sequence>

<xs:element name="from" type="xs:positiveInteger"/>