Instead of using the usual »HelloWorld« example, we start directly with a small Schematron schema. The Ark instance serves as a rewarding source. Firstly, we will check whether a carnivore has been accommodated with a herbivore in the same room (which is known to run contrary to the purpose of the preservation of the species):
<schema xmlns="http://purl.oclc.org/dsdl/schematron"> <ns uri="http://www.schematron.info/ark" prefix="ark"/> <pattern> <rule context="ark:animal[@carnivore='yes']"> <report test="parent::*/ark:animal[@carnivore='no']"> There are carnivores and herbivores in one accommodation. The animals are not a food source! </report> </rule> </pattern> </schema>
The <schema> root element with the namespace "http://purl.oclc.org/dsdl/schematron" is used in order to identify the ISO Schematron language.
In the present example the five most important Schematron elements being necessary to write a simple schema are used: <schema>, <pattern> , <rule> and <report> as well as <ns>. One exception is the <ns> element for the namespace since it can be omitted in certain cases. However, it is essential for our example because the Ark instance has been assigned to a namespace.
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