<?xml version="1.0"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
	targetNamespace="http://nvd.nist.gov/feeds/cve/1.2"
	xmlns:cve="http://nvd.nist.gov/feeds/cve/1.2"
	elementFormDefault="qualified" attributeFormDefault="unqualified"
	version="1.2">
	<xs:annotation>
		<xs:documentation>This schema defines the structure of the National
			Vulnerability Database XML feed files version: 1.2. The elements and
			attribute in this document are described by xs:annotation tags. This
			file is kept at http://nvd.nist.gov/schema/nvdcve.xsd. The NVD XML
			feeds are available at http://nvd.nist.gov/download.cfm.
			
			Release Notes:
			
			Version 1.2:
			* CVSS version 2 scores and vectors have been added.  Please see
			http://nvd.nist.gov/cvss.cfm?vectorinfo and
			http://www.first.org/cvss/cvss-guide.html for more information on
			how to interpret this data. </xs:documentation>
	</xs:annotation>
	<xs:element name="nvd">
		<xs:annotation>
			<xs:documentation>The root element of the NVD CVE feed. Multiple "entry" child elements describe specific NVD CVE entries.</xs:documentation>
		</xs:annotation>
		<xs:complexType>
			<xs:sequence>
				<xs:element ref="cve:entry" minOccurs="0" maxOccurs="unbounded"/>
			</xs:sequence>
			<xs:attribute name="nvd_xml_version" type="xs:NMTOKEN" use="required">
				<xs:annotation>
					<xs:documentation>The schema version number supported by the feed.</xs:documentation>
				</xs:annotation>
			</xs:attribute>
			<xs:attribute name="pub_date" type="cve:dateType" use="required">
				<xs:annotation>
					<xs:documentation>The date the feed was generated.</xs:documentation>
				</xs:annotation>
			</xs:attribute>
		</xs:complexType>
	</xs:element>

	<xs:element name="entry" type="cve:entryType">
		<xs:annotation>
			<xs:documentation>A CVE entry.</xs:documentation>
		</xs:annotation>
	</xs:element>
	
	<!-- ******************************************************************* -->
	<!-- * Complex Types                                                   * -->
	<!-- ******************************************************************* -->
	<xs:complexType name="entryType">
		<xs:annotation>
			<xs:documentation> Documents one CVE entry. The child elements should always
				appear in the sequence defined below. These elements are compatible with
				entry elements from the CVE XML feeds.</xs:documentation>
		</xs:annotation>
		<xs:sequence>
			<xs:element name="desc">
				<xs:annotation>
					<xs:documentation>Description wrapper tag, parent to any
						documented descriptions of this CVE entry. While the "desc"
						tag will always be present, there may be no "descript" child
						tags. Only one "descript" tag will exist for each
						description source (i.e. CVE, NVD, ...). </xs:documentation>
				</xs:annotation>
				<xs:complexType>
					<xs:sequence>
						<xs:element name="descript" type="cve:descriptType" minOccurs="0" maxOccurs="2">
							<xs:annotation>
								<xs:documentation>A description of a CVE entry
									from the source indicated by the "source"
									attribute.</xs:documentation>
							</xs:annotation>
						</xs:element>
					</xs:sequence>
				</xs:complexType>
			</xs:element>
			<xs:element name="impacts" minOccurs="0">
				<xs:annotation>
					<xs:documentation> Impact wrapper tag (may or may not be
						present). Only one "impact" tag will exist for each impact
						explanation source. </xs:documentation>
				</xs:annotation>
				<xs:complexType>
					<xs:sequence>
						<xs:element name="impact" type="cve:impactType">
							<xs:annotation>
								<xs:documentation> Contains a specific impact
								explanation of this CVE entry from source
								indicated by the "source" attribute.
								</xs:documentation>
							</xs:annotation>
						</xs:element>
					</xs:sequence>
				</xs:complexType>
			</xs:element>
			<xs:element name="sols" type="cve:solsType" minOccurs="0">
				<xs:annotation>
					<xs:documentation> Solution wrapper tag (may or may not be
						present). Only one "sol" tag will exist for each solution
						explanation source. </xs:documentation>
				</xs:annotation>
			</xs:element>
			<xs:element name="loss_types" type="cve:lossTypeType" minOccurs="0">
				<xs:annotation>
					<xs:documentation> Loss type tag (may or may not be present).
						Contains one loss type child for each loss type of this CVE
						entry. Potential loss types are: "avail" => availability
						"conf" => confidentiality "int" => integrity "sec_prot" =>
						security protection </xs:documentation>
				</xs:annotation>
			</xs:element>
			<xs:element name="vuln_types" type="cve:vulnType" minOccurs="0">
				<xs:annotation>
					<xs:documentation> Vulnerability type tag (may or may not be
						present). Contains one vulnerability type child for each
						vulnerability type of this CVE entry. Potential
						vulnerability types are: "access" => Access validation error
						"input" => Input validation error "design" => Design error
						"exception" => Exceptional condition error "env" =>
						Environmental error "config" => Configuration error "race"
						=> Race condition error "other" => other </xs:documentation>
				</xs:annotation>
			</xs:element>
			<xs:element name="range" type="cve:rangeType" minOccurs="0">
				<xs:annotation>
					<xs:documentation> Vulnerability range tag (may or may not be
						present). Contains one vulnerability range child for each
						vulnerability range of this CVE entry. Potential
						vulnerability ranges are: "local" => Locally exploitable
						"local_network" => Local network exploitable "network" =>
						Network exploitable "user_init" => User accesses attacker
					</xs:documentation>
				</xs:annotation>
			</xs:element>
			<xs:element name="refs">
				<xs:annotation>
					<xs:documentation> Reference wrapper tag (always present).
						External references to this CVE entry are contained within
						this tag. </xs:documentation>
				</xs:annotation>
				<xs:complexType>
					<xs:sequence>
						<xs:element name="ref" type="cve:refType" minOccurs="0" maxOccurs="unbounded">
							<xs:annotation>
								<xs:documentation> Individual reference to this CVE
								entry. Text is the name of this vulnerability at
								this particular reference. Attributes: "source"
								(required) => Name of reference source "url"
								(required) => hyperlink to reference "sig" =>
								indicates this reference includes a tool
								signature "adv" => indicates this reference is a
								Security Advisory "patch" => indicates this
								reference includes a patch for this
								vulnerability </xs:documentation>
							</xs:annotation>
						</xs:element>
					</xs:sequence>
				</xs:complexType>
			</xs:element>
			<xs:element name="vuln_soft" type="cve:vulnSoftType" minOccurs="0">
				<xs:annotation>
					<xs:documentation> Vulnerable software wrapper tag (may or may
						not be present). Software affected by this CVE entry are
						listed within this tag. </xs:documentation>
				</xs:annotation>
			</xs:element>
		</xs:sequence>
		<xs:attribute name="type" use="required">
			<xs:annotation>
				<xs:documentation>CVE or CAN</xs:documentation>
			</xs:annotation>
			<xs:simpleType>
				<xs:restriction base="xs:NMTOKEN">
					<xs:enumeration value="CAN"/>
					<xs:enumeration value="CVE"/>
				</xs:restriction>
			</xs:simpleType>
		</xs:attribute>
		<xs:attribute name="name" use="required">
			<xs:annotation>
				<xs:documentation>the full CVE name</xs:documentation>
			</xs:annotation>
			<xs:simpleType>
				<xs:restriction base="xs:ID">
					<xs:pattern value="(CAN|CVE)\-\d\d\d\d\-\d\d\d\d"/>
				</xs:restriction>
			</xs:simpleType>
		</xs:attribute>
		<xs:attribute name="seq" use="required">
			<xs:annotation>
				<xs:documentation>the sequence number from CVE name</xs:documentation>
			</xs:annotation>
			<xs:simpleType>
				<xs:restriction base="xs:NMTOKEN">
					<xs:pattern value="\d\d\d\d\-\d\d\d\d"/>
				</xs:restriction>
			</xs:simpleType>
		</xs:attribute>
		<xs:attribute name="nvd_name" type="xs:string">
			<xs:annotation>
				<xs:documentation>the NVD name (if it exists)</xs:documentation>
			</xs:annotation>
		</xs:attribute>
		<xs:attribute name="discovered" type="cve:dateType">
			<xs:annotation>
				<xs:documentation>the date this entry was discovered</xs:documentation>
			</xs:annotation>
		</xs:attribute>
		<xs:attribute name="published" type="cve:dateType" use="required">
			<xs:annotation>
				<xs:documentation>the date this entry was published</xs:documentation>
			</xs:annotation>
		</xs:attribute>
		<xs:attribute name="modified" type="cve:dateType">
			<xs:annotation>
				<xs:documentation>the date this entry was last modified</xs:documentation>
			</xs:annotation>
		</xs:attribute>
		<xs:attribute name="severity">
			<xs:annotation>
				<xs:documentation>the entry's severity as determined by the NVD analysts: High, Medium, or Low</xs:documentation>
			</xs:annotation>
			<xs:simpleType>
				<xs:restriction base="xs:NMTOKEN">
					<xs:enumeration value="High"/>
					<xs:enumeration value="Medium"/>
					<xs:enumeration value="Low"/>
				</xs:restriction>
			</xs:simpleType>
		</xs:attribute>
		<xs:attribute name="reject" type="cve:trueOnlyAttribute">
			<xs:annotation>
				<xs:documentation>indicates that this CVE entry has been rejected by CVE or NVD</xs:documentation>
			</xs:annotation>
		</xs:attribute>
		<xs:attribute name="CVSS_version" type="xs:string">
			<xs:annotation>
				<xs:documentation>the CVSS Version Indicator</xs:documentation>
			</xs:annotation>
		</xs:attribute>
		<xs:attribute name="CVSS_score" type="cve:zeroToTen">
			<xs:annotation>
				<xs:documentation>Same as the CVSS_base_score to provide backwards compatability with the previous CVE XML feed format. This field is deprecated an may be removed at a future date.</xs:documentation>
			</xs:annotation>
		</xs:attribute>
		<xs:attribute name="CVSS_base_score" type="cve:zeroToTen">
			<xs:annotation>
				<xs:documentation>CVSS version 2 Base Score</xs:documentation>
			</xs:annotation>
		</xs:attribute>
		<xs:attribute name="CVSS_impact_subscore" type="cve:zeroToTen">
			<xs:annotation>
				<xs:documentation>CVSS version 2 Impact Score</xs:documentation>
			</xs:annotation>
		</xs:attribute>
		<xs:attribute name="CVSS_exploit_subscore" type="cve:zeroToTen">
			<xs:annotation>
				<xs:documentation>CVSS version 2 Exploit Score</xs:documentation>
			</xs:annotation>
		</xs:attribute>
		<xs:attribute name="CVSS_vector" type="cve:CVSSVector">
			<xs:annotation>
				<xs:documentation>the CVSS version 2 Vector string</xs:documentation>
			</xs:annotation>
		</xs:attribute>
	</xs:complexType>

	<xs:complexType name="descriptType">
		<xs:simpleContent>
			<xs:extension base="xs:string">
				<xs:attribute name="source" type="cve:descriptSourceType" use="required">
					<xs:annotation>
						<xs:documentation>The source of the CVE description.</xs:documentation>
					</xs:annotation>
				</xs:attribute>
			</xs:extension>
		</xs:simpleContent>
	</xs:complexType>
	
	<xs:complexType name="impactType">
		<xs:simpleContent>
			<xs:extension base="xs:string">
				<xs:attribute name="source" type="cve:impactSourceType" use="required">
				</xs:attribute>
			</xs:extension>
		</xs:simpleContent>
	</xs:complexType>

	<xs:complexType name="vulnType">
		<xs:sequence>
			<xs:element name="access" minOccurs="0"/>
			<xs:element name="input" minOccurs="0">
				<xs:annotation>
					<xs:documentation> Input validation error tag with
						one attribute for each input validation error
						type. Potential input validation error types
						are: "bound" => Boundary condition error
						"buffer" => Buffer overflow </xs:documentation>
				</xs:annotation>
				<xs:complexType>
					<xs:attribute name="bound" type="cve:trueOnlyAttribute"/>
					<xs:attribute name="buffer" type="cve:trueOnlyAttribute"
					/>
				</xs:complexType>
			</xs:element>
			<xs:element name="design" minOccurs="0"/>
			<xs:element name="exception" minOccurs="0"/>
			<xs:element name="env" minOccurs="0"/>
			<xs:element name="config" minOccurs="0"/>
			<xs:element name="race" minOccurs="0"/>
			<xs:element name="other" minOccurs="0"/>
		</xs:sequence>
	</xs:complexType>

	<xs:complexType name="solsType">
		<xs:sequence>
			<xs:element name="sol">
				<xs:annotation>
					<xs:documentation> Contains a specific solution
						explanation of this CVE entry from source
						indicated by the "source" attribute.
					</xs:documentation>
				</xs:annotation>
				<xs:complexType mixed="true">
					<xs:simpleContent>
						<xs:extension base="xs:string">
							<xs:attribute name="source" type="cve:solsSourceType" use="required">
							</xs:attribute>
						</xs:extension>
					</xs:simpleContent>
				</xs:complexType>
			</xs:element>
		</xs:sequence>
	</xs:complexType>

	<xs:complexType name="lossTypeType">
		<xs:sequence>
			<xs:element name="avail" minOccurs="0"/>
			<xs:element name="conf" minOccurs="0"/>
			<xs:element name="int" minOccurs="0"/>
			<xs:element name="sec_prot" minOccurs="0">
				<xs:annotation>
					<xs:documentation> Security Protection tag with one
						attribute for each security protection type.
						Potential security protection types are: "admin"
						=> gain administrative access "user" => gain
						user access "other" => other </xs:documentation>
				</xs:annotation>
				<xs:complexType>
					<xs:attribute name="admin" type="cve:trueOnlyAttribute"/>
					<xs:attribute name="user" type="cve:trueOnlyAttribute"/>
					<xs:attribute name="other" type="cve:trueOnlyAttribute"
					/>
				</xs:complexType>
			</xs:element>
		</xs:sequence>
	</xs:complexType>

	<xs:complexType name="rangeType">
		<xs:sequence>
			<xs:element name="local" minOccurs="0"/>
			<xs:element name="local_network" minOccurs="0"/>
			<xs:element name="network" minOccurs="0"/>
			<xs:element name="user_init" minOccurs="0"/>
		</xs:sequence>
	</xs:complexType>

	<xs:complexType name="refType">
		<xs:simpleContent>
			<xs:extension base="xs:string">
				<xs:attribute name="source" type="xs:string" use="required"/>
				<xs:attribute name="url" type="cve:urlType" use="required"/>
				<xs:attribute name="sig" type="cve:trueOnlyAttribute"/>
				<xs:attribute name="adv" type="cve:trueOnlyAttribute"/>
				<xs:attribute name="patch" type="cve:trueOnlyAttribute"/>
			</xs:extension>
		</xs:simpleContent>
	</xs:complexType>

	<xs:complexType name="vulnSoftType">
		<xs:sequence>
			<xs:element name="prod" maxOccurs="unbounded">
				<xs:annotation>
					<xs:documentation> Product wrapper tag. Versions of
						this product that are affected by this
						vulnerability are listed within this tag.
						Attributes: "name" => Product name "vendor" =>
						Vendor of this product </xs:documentation>
				</xs:annotation>
				<xs:complexType>
					<xs:sequence>
						<xs:element name="vers" maxOccurs="unbounded">
							<xs:annotation>
								<xs:documentation> Represents a version
									of this product that is affected by
									this vulnerability. Attributes:
									"num" => This version number "prev"
									=> Indicates that versions previous
									to this version number are also
									affected by this vulnerability
									"edition" => Indicates the edition
									associated with the version number
								</xs:documentation>
							</xs:annotation>
							<xs:complexType>
								<xs:attribute name="num"
									type="xs:string" use="required"/>
								<xs:attribute name="prev"
									type="cve:trueOnlyAttribute"/>
								<xs:attribute name="edition"
									type="xs:string"/>
							</xs:complexType>
						</xs:element>
					</xs:sequence>
					<xs:attribute name="name" type="xs:string"
						use="required"/>
					<xs:attribute name="vendor" type="xs:string"
						use="required"/>
				</xs:complexType>
			</xs:element>
		</xs:sequence>
	</xs:complexType>

	<!-- ******************************************************************* -->
	<!-- * Simple Types                                                    * -->
	<!-- ******************************************************************* -->
	<xs:simpleType name="descriptSourceType">
		<xs:restriction base="xs:NMTOKEN">
			<xs:enumeration value="cve"/>
			<xs:enumeration value="nvd"/>
		</xs:restriction>
	</xs:simpleType>

	<xs:simpleType name="impactSourceType">
		<xs:restriction base="xs:NMTOKEN">
			<xs:enumeration value="nvd"/>
		</xs:restriction>
	</xs:simpleType>

	<xs:simpleType name="solsSourceType">
		<xs:restriction base="xs:NMTOKEN">
			<xs:enumeration value="nvd"/>
		</xs:restriction>
	</xs:simpleType>

	<xs:simpleType name="dateType">
		<xs:annotation>
			<xs:documentation> Defines date format for NVD. Dates follow the mask "yyyy-mm-dd"
			</xs:documentation>
		</xs:annotation>
		<xs:restriction base="xs:string">
			<xs:pattern
				value="(19|20)\d\d-((01|03|05|07|08|10|12)-(0[1-9]|[1-2]\d|3[01])|(04|06|09|11)-(0[1-9]|[1-2]\d|30)|02-(0[1-9]|1\d|2\d))"
			/>
		</xs:restriction>
	</xs:simpleType>
	<xs:simpleType name="urlType">
		<xs:annotation>
			<xs:documentation> Restricts urls in NVD beyond the xs:anyURI restrictions.
			</xs:documentation>
		</xs:annotation>
		<xs:restriction base="xs:anyURI">
			<xs:whiteSpace value="collapse"/>
			<xs:pattern value="(news|(ht|f)tp(s)?)://.+"/>
		</xs:restriction>
	</xs:simpleType>
	<xs:simpleType name="trueOnlyAttribute">
		<xs:annotation>
			<xs:documentation> simpleType used for attributes that are only present when they are
				true. Such attributes appear only in the form attribute_name="1".
			</xs:documentation>
		</xs:annotation>
		<xs:restriction base="xs:NMTOKEN">
			<xs:enumeration value="1"/>
		</xs:restriction>
	</xs:simpleType>
	<xs:simpleType name="zeroToTen">
		<xs:annotation>
			<xs:documentation> simpleType used when scoring on a scale of 0-10, inclusive
			</xs:documentation>
		</xs:annotation>
		<xs:restriction base="xs:decimal">
			<xs:minInclusive value="0" fixed="true"/>
			<xs:maxInclusive value="10" fixed="true"/>
		</xs:restriction>
	</xs:simpleType>
	<xs:simpleType name="CVSSVector">
		<xs:annotation>
			<xs:documentation>simpleType to describe the CVSS Base Vector </xs:documentation>
		</xs:annotation>
		<xs:restriction base="xs:string">
 			<xs:pattern
				value="\(AV:[LAN]/AC:[HML]/Au:[NSM]/C:[NPC]/I:[NPC]/A:[NPC]\)"/>
		</xs:restriction>
	</xs:simpleType>
</xs:schema>
