openaire#60 add URL identifier to patent

schemas/includes/patent-identifiers.xsd

@@ -0,0 +1,64 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:cf="urn:xmlns:org.eurocris.cerif" xmlns:cflink="https://w3id.org/cerif/annotations#"  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" attributeFormDefault="unqualified" elementFormDefault="qualified" xml:lang="en"
+	xsi:schemaLocation="http://www.w3.org/2001/XMLSchema https://www.w3.org/2001/XMLSchema.xsd">
+	<xs:annotation>
+		<xs:documentation>This is the XML Schema component for the OpenAIRE CERIF profile 1.1 which specifies the admissible patent identifiers.
+			For further description please see the main schema file.
+			This work is licensed under a Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/).
+		</xs:documentation>
+	</xs:annotation>
+
+    <xs:include schemaLocation="../includes/cerif-base-identifiers.xsd">
+        <xs:annotation>
+            <xs:documentation>The basic types of identifiers for use with schemas.</xs:documentation>
+        </xs:annotation>
+    </xs:include>
+
+	<xs:include schemaLocation="../includes/cerif-commons.xsd">
+		<xs:annotation>
+			<xs:documentation>The common building blocks for any CERIF XML Schema.</xs:documentation>
+		</xs:annotation>
+	</xs:include>
+
+	<xs:group name="PatentIdentifiers__Group">
+		<xs:sequence>
+
+            <xs:element cflink:identifier="true" cflink:link="https://w3id.org/cerif/vocab/IdentifierTypes#URL" minOccurs="0" name="URL" type="cfString__Type"/>
+
+<!-- A skeleton for contributing new identifier types
+			## ideally please submit a GitHub pull request with branch called 'add-XXX'
+			## but we will welcome your contribution no matter how you choose to communicate it to us  
+			<xs:element cflink:identifier="true" minOccurs="0" name="XXX">
+				<xs:annotation>
+					<xs:documentation xml:lang="en">The XXX identifier</xs:documentation>
+					<xs:appinfo>
+						## @id: please generate a fresh Version 4 UUID (e.g. through the 'uuidgen | tr A-F a-f' linux or macOS commands or online at https://www.uuidgenerator.net/version4)
+						<cf:Service id="">
+							## please keep the cf:Name equal to the beginning of the xs:documentation above, per @xml:lang
+							<cf:Name xml:lang="en">The XXX identifier</cf:Name>
+							## please provide a short description of the scope of the identifier service and supply a pointer to a webpage with more details
+							<cf:Description xml:lang="en">The service of registering YYY and assigning identifiers to them.  See ZZZ for more details.</cf:Description>
+						</cf:Service>
+					</xs:appinfo>
+				</xs:annotation>
+				<xs:complexType>
+					<xs:simpleContent>
+						<xs:restriction base="cfString__Type">
+							## @value: please supply a regular expression the values shall match
+							<xs:pattern value="">
+								<xs:annotation>
+									## and document where you got it from
+									<xs:documentation source=""/>
+								</xs:annotation>
+							</xs:pattern>
+							## or at least specify (in @value) the maximum length of the admissible values of the identifier
+							<xs:maxLength value=""/>
+						</xs:restriction>
+					</xs:simpleContent>
+				</xs:complexType>
+			</xs:element>
+ -->
+		</xs:sequence>
+	</xs:group>
+
+</xs:schema>

schemas/openaire-cerif-profile.xsd

@@ -43,12 +43,18 @@
 </xs:annotation>
 </xs:include>
 
-	<xs:include schemaLocation="includes/product-identifiers.xsd">
+<xs:include schemaLocation="includes/product-identifiers.xsd">
 <xs:annotation>
 <xs:documentation>The product identifiers.</xs:documentation>
 </xs:annotation>
 </xs:include>
 
+	<xs:include schemaLocation="includes/patent-identifiers.xsd">
+		<xs:annotation>
+			<xs:documentation>The patent identifiers.</xs:documentation>
+		</xs:annotation>
+	</xs:include>
+
 	<xs:import namespace="http://purl.org/coar/access_right" schemaLocation="vocabularies/coar_accessrights.xsd"/>
 
 <xs:include schemaLocation="./includes/cerif-commons.xsd">
@@ -939,7 +945,7 @@ Source: Wikipedia
 
 						<xs:element cflink:attribute="https://w3id.org/cerif/model#ResultPatent.PatentNumber" minOccurs="0" name="PatentNumber" type="cfString__Type"/>
 
-
+						<xs:group ref="PatentIdentifiers__Group"/>
 
 						<xs:element cflink:container="ordered" minOccurs="0" name="Inventors">
 							<xs:annotation>