- updated XML schema

xsd/archive.xsd

 <?xml version="1.0" encoding="UTF-8"?>
-<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified" targetNamespace="http://slub-dresden.de" xmlns:archive="http://slub-dresden.de" xmlns:v3="http://www.loc.gov/mods/v3" xmlns:mets="http://www.loc.gov/METS/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xlink="http://www.w3.org/1999/xlink">
-  <xs:import namespace="http://www.loc.gov/METS/" schemaLocation="sip.xsd"/>
-  <xs:import namespace="http://www.loc.gov/mods/v3" schemaLocation="v3.xsd"/>
-  <xs:import namespace="http://www.w3.org/1999/xlink" schemaLocation="xlink.xsd"/>
-  <xs:import namespace="http://www.w3.org/2001/XMLSchema-instance" schemaLocation="xsi.xsd"/>
-  <xs:element name="record">
-    <xs:complexType>
-      <xs:sequence>
-        <xs:element ref="archive:exportToArchiveDate"/>
-        <xs:element ref="archive:externalId"/>
-        <xs:element ref="archive:externalWorkflow"/>
-        <xs:element ref="archive:hasConservationReason"/>
-        <xs:element ref="archive:externalIsilId"/>
-        <xs:element ref="archive:archivalValueDescription"/>
-      </xs:sequence>
+<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified" attributeFormDefault="unqualified" targetNamespace="http://slub-dresden.de/slubarchiv" xmlns:archive="http://slub-dresden.de/slubarchiv">
+  <xs:element name="record" type="archive:record"/>
+  <xs:complexType name="record">
+    <xs:all>
+      <xs:element name="archivalValueDescription" type="archive:NonEmptyString" minOccurs="1" maxOccurs="1"/>
+      <xs:element name="exportToArchiveDate" type="xs:dateTime" minOccurs="1" maxOccurs="1"/>
+      <xs:element name="externalId" type="archive:LzaIdSubstring" minOccurs="1" maxOccurs="1"/>
+      <xs:element name="externalIsilId" type="archive:NonEmptyString" minOccurs="0" maxOccurs="1"/>
+      <xs:element name="externalWorkflow" type="archive:LzaIdSubstring" minOccurs="1" maxOccurs="1"/>
+      <xs:element name="hasConservationReason" type="xs:boolean" minOccurs="1" maxOccurs="1"/>
+    </xs:all>
+    <xs:attribute name="version" type="archive:SipVersionString" use="required"/>
   </xs:complexType>
-  </xs:element>
-  <xs:element name="exportToArchiveDate" type="xs:dateTime"/>
-  <xs:element name="externalId" type="xs:string"/>
-  <xs:element name="externalWorkflow" type="xs:string"/>
-  <xs:element name="hasConservationReason" type="xs:boolean"/>
-  <xs:element name="externalIsilId" type="xs:string"/>
-  <xs:element name="archivalValueDescription" type="xs:string"/>
+  <xs:simpleType name="NonEmptyString">
+    <xs:restriction base="xs:string">
+      <xs:pattern value="[\s\S]*[^ ][\s\S]*"/>
+    </xs:restriction>
+  </xs:simpleType>
+  <xs:simpleType name="LzaIdSubstring">
+    <xs:restriction base="xs:string">
+      <xs:pattern value="[a-z0-9]+"/>
+    </xs:restriction>
+  </xs:simpleType>
+  <xs:simpleType name="SipVersionString">
+    <xs:restriction base="xs:string">
+      <xs:enumeration value="v2017.1"/>
+    </xs:restriction>
+  </xs:simpleType>
 </xs:schema>