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+<?xml version="1.0"?>
+
+<!DOCTYPE shop [
+<!ELEMENT shop (section+)>
+<!ELEMENT section (shelf+)>
+<!ELEMENT shelf (product*)>
+<!ATTLIST shelf type CDATA "">
+<!ELEMENT product (name, price)>
+<!ELEMENT name (#PCDATA)>
+<!ELEMENT price (#PCDATA)>
+]>
+
+<shop>
+<section>
+<shelf type="food">
+<product>
+<name>bread</name>
+<price>1,50</price>
+</product>
+</shelf>
+<shelf type="stationery">
+<product>
+<name>notebook</name>
+<price>2,00</price>
+</product>
+</shelf>
+<shelf type="clothing">
+<product>
+<name>blouse</name>
+<price>50,00</price>
+</product>
+</shelf>
+</section>
+</shop>
\ No newline at end of file