Assembling Rules in a Schema
You've seen how to write rule
and diagnostic
elements. Now it's time to assemble these elements in a complete schema.
Schematron Schemas
In brief, rule
elements go into pattern
elements and diagnostic
elements go into diagnostics
elements, and all of those are packed within a schema
element. For example:
<?xml version="1.0" encoding="UTF-8"?> <schema xmlns="http://www.ascc.net/xml/schematron"> <pattern name="main"> <rule context="book"> <assert test="@id">Missing "id" attribute.</assert> <assert test="isbn">Missing "isbn" element.</assert> <assert test="@id = concat('b', isbn)">The "id" attribute should be the ISBN number with a prefix "b" </assert> </rule> <rule context="*[@id]"> <report test="preceding::*/@id = @id" diagnostics="idAttribute-en idAttribute-fr "/> </rule> </pattern> <diagnostics> <diagnostic id="idAttribute-en" xml:lang="en">The id attribute "<value-of select="@id"/>" is duplicated in element "<value-of select="name()"/>".</diagnostic> <diagnostic id="idAttribute-fr" xml:lang="fr">L'attribut id "<value-of select="@id"/>" de l'élément "<value-of select="name()"/> est dupliqué".</diagnostic> </diagnostics> </schema>
Note
The namespace URI for Schematron 1.5 is http://www.ascc.net/xml/schematron.
The namespace URI for ISO Schematron is http://purl.oclc.org/dsdl/schematron.
What Does This Schema Mean?
This seems intuitive enough, but there are still important questions that need an answer. For instance, in the previous example, book
elements obviously ...
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