Schematron

WHAT IS INSIDE?

• XML SCHEMA LANGUAGES

• SCHEMATRON INTRODUCTION

• SCHEMATRON PROCESSING

• SCHEMATRON EXAMPLE

XML SCHEMA LANGUAGES

TWO TYPES OF SCHEMA LANGUAGE  

1. Grammar-based schema languages

2. Rule-based schema languages

GRAMMAR-BASED SCHEMA LANGUAGES

DOCUMENT TYPE DEFINITION-DTD

• include the definition of internal and external entities

• schema features focus on describing elements

• Every element and attribute used by the document type defined by the DTD must be described

• Each element must have a content model, identifying which child elements or text nodes are allowed, as well as a list of permissible attributes, if any attributes are allowed

SCHEMA LANGUAGE

GRAMMAR-BASED

RULE-BASED

DTD

RELAX-NG

XML-SCHEMA

SCHEMATRON

SCHEMATRON INTRODUCTION

• a rule-based language

• uses path expressions instead of grammars

• open schema language

• has been designed to be implemented on XSLT

• Way to test XML documents

• Way to specify and test statements about your XML document

  • element

  • attribute

  • content

WHY WE USE SCHEMATRON?

• Different requirements at different stages of the document lifecycle

• Local or temporary requirements 
  

• Unusual variations to manage

WHEN WE USE SCHEMATRON?

• Validate output of a program against its input or vice versa

• validate things schemas can’t express

• run reports

• find patterns in document

SCHEMATRON HIERARCHY

phases

patterns

rules

assertions/report

Activate different families at different time

Rules are grouped into families

Test are collected into rules,apply to one element

Are to be tested

SCHEMATRON PROCESSING

Schematron processors

XSLT-based

processors

XPath-based processors

PROCESSING USING XSLT

SIMILARITIES OF XSLT

<?xml version="1.0" encoding="UTF-8"?>
<books>
    <book author="Jayathilake">
        <shortstory author="Jayathilake">
            <name></name>
            <version></version>
        </shortstory>
        <novel>
            <name></name>
            <version></version>
        </novel>
    </book>
    
    <book author="Wickramasinghe">
        <shortstory>
            <name></name>
            <version></version>
        </shortstory>
        <novel>
            <name></name>
            <version></version>
        </novel>
    </book>
</books>

<xsl:template match="book">-----------------------------------similar to rule
        <xsl:if test=".[child::node()[attribute::author]]">---similar to assertion
            <xsl:message>invalid Book</xsl:message>
        </xsl:if>
        <xsl:if test=".[attribute::author]">-------------------similar to report
            <xsl:message>Valid book</xsl:message>
        </xsl:if>
</xsl:template>

<sch:schema xmlns:sch="http://purl.oclc.org/dsdl/schematron" queryBinding="xslt2"
    xmlns:sqf="http://www.schematron-quickfix.com/validator/process">
    <sch:pattern name="book-validation">
        <sch:rule context="book">
            <sch:assert test=".[child::node()[attribute::author]]">
                Invalid book
            </sch:assert>
            
            <sch:report test=".[attribute::author]">
                Valid book
            </sch:report>
        </sch:rule>
    </sch:pattern>
</sch:schema>

THANK YOU..!