Monday, August 7, 2017

Mathematical table data with XML Schema 1.1

Here's a simple example, using XML Schema 1.1 <assert> to validate elementary school mathematical tables.

XML document:
<?xml version="1.0"?>
<table id="2">
  <x>2</x>
  <x>4</x>
  <x>6</x>
  <x>8</x>
  <x>10</x>
  <x>12</x>
  <x>14</x>
  <x>16</x>
  <x>18</x>
  <x>20</x>
</table>

XSD 1.1 document:
<?xml version="1.0"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
 
   <xs:element name="table">
     <xs:complexType>
        <xs:sequence>
           <xs:element name="x" minOccurs="10" maxOccurs="10"/>
        </xs:sequence>
        <xs:attribute name="id" type="xs:positiveInteger" use="required">
           <xs:annotation>
             <xs:documentation>Mathematical table of @id is represented.</xs:documentation>
           </xs:annotation>
        </xs:attribute>
        <xs:assert test="x[1] = @id"/>
        <xs:assert test="every $x in x[position() gt 1] satisfies $x = $x/preceding-sibling::x[1] + @id">
           <xs:annotation>
              <xs:documentation>An XPath 2.0 expression validating the depicted mathematical table.    
              </xs:documentation>
           </xs:annotation>
        </xs:assert>
     </xs:complexType>
   </xs:element>
 
</xs:schema>

Tuesday, August 1, 2017

Great write up on XML Schema 1.1

On this page, http://www.xfront.com/xml-schema-1-1/ Roger L. Costello has posted some wonderful write up on XML Schema 1.1 technology. Enthusiasts are encouraged to read that.

Roger's language is very simple, and covers almost everything from the perspective of XML Schema 1.1 user's needs.