<xsd:simpleType name="ISSNType">
<xsd:annotation>
<xsd:documentation>The International Standard Serial Number is an eight-digit number which identifies all periodical publications as such, including electronic serials. Each ISSN assigned to a serial publication is registered in an international database: the ISSN Register.The ISSN is defined by the ISO 3297 standard. The ISSN can be applied to series of books. A book belonging to a particular series will have both an ISSN (identifying the series) and an ISBN (identifying the given monograph as such).</xsd:documentation>
</xsd:annotation>
<xsd:restriction base="oa:StringType">
<xsd:pattern value="[0-9]{4}-[0-9]{3}[0-9,X]{1}" />
</xsd:restriction>
</xsd:simpleType>
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