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/usr/share/arc/schema/tls.xsd is in libarccommon3v5 5.4.2-1build1.

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The actual contents of the file can be viewed below.

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<?xml version="1.0" encoding="UTF-8"?>
<xsd:schema
    xmlns:xsd="http://www.w3.org/2001/XMLSchema"
    targetNamespace="http://www.nordugrid.org/schemas/tls/2009/08"
    xmlns="http://www.nordugrid.org/schemas/tls/2009/08"
    elementFormDefault="qualified"
    attributeFormDefault="unqualified">

<xsd:element name="KeyPath" type="xsd:string" default="/etc/grid-security/hostkey.pem">
    <xsd:annotation>
        <xsd:documentation xml:lang="en">
        Location of private key.
        Default is /etc/grid-security/hostkey.pem for service
        and $HOME/.globus/userkey.pem for client.
        </xsd:documentation>
    </xsd:annotation>
</xsd:element>

<xsd:element name="CertificatePath" type="xsd:string" default="/etc/grid-security/hostcert.pem">
    <xsd:annotation>
        <xsd:documentation xml:lang="en">
        Location of public certificate.
        Default is /etc/grid-security/hostcert.pem for service and
        $HOME/.globus/usercert.pem for client.
        </xsd:documentation>
    </xsd:annotation>
</xsd:element>

<xsd:element name="ProxyPath" type="xsd:string">
    <xsd:annotation>
        <xsd:documentation xml:lang="en">
        Location of proxy credentials - includes certificates,
        key and chain of involved certificates. Overwrites
        elements KeyPath and CertificatePath. Default is /tmp/hash{userid}.0 for client,
        and none for service.
        </xsd:documentation>
    </xsd:annotation>
</xsd:element>

<xsd:element name="Credential" type="xsd:string">
    <xsd:annotation>
        <xsd:documentation xml:lang="en">
        String representation of credentials. It may simply be the contents of
        the proxy file or a string representing any other kind of credential.
        </xsd:documentation>
    </xsd:annotation>
</xsd:element>

<xsd:element name="CACertificatePath" type="xsd:string">
    <xsd:annotation>
        <xsd:documentation xml:lang="en">
        Location of certificate of CA. Default is none.
        </xsd:documentation>
    </xsd:annotation>
</xsd:element>

<xsd:element name="CACertificatesDir" default="/etc/grid-security/certificates">
    <xsd:complexType>
        <xsd:annotation>
            <xsd:documentation xml:lang="en">
            Directory containing certificates of accepted CAs.
            Default is /etc/grid-security/certificates
            </xsd:documentation>
        </xsd:annotation>
        <xsd:simpleContent>
            <xsd:extension base="xsd:string">
                <xsd:attribute name="PolicyGlobus" type="xsd:boolean" use="optional" default="false"/>
            </xsd:extension>
        </xsd:simpleContent>
    </xsd:complexType>
</xsd:element>

<xsd:element name="VOMSDir" default="/etc/grid-security/vomsdir">
    <xsd:complexType>
        <xsd:annotation>
            <xsd:documentation xml:lang="en">
            Directory containing per-VO subdirectories each containing
            per-host *.lsc VOMS configuration files.
            Default is /etc/grid-security/vomsdir
            </xsd:documentation>
        </xsd:annotation>
        <xsd:simpleContent>
            <xsd:extension base="xsd:string">
            </xsd:extension>
        </xsd:simpleContent>
    </xsd:complexType>
</xsd:element>

<xsd:element name="ClientAuthn" type="xsd:boolean" default="true">
    <xsd:annotation>
        <xsd:documentation xml:lang="en">
         Whether checking client certificate. Only needed for service side.
        Default is "true"
        </xsd:documentation>
    </xsd:annotation>
</xsd:element>

<xsd:element name="VOMSCertTrustDNChain">
    <xsd:complexType>
        <xsd:annotation>
            <xsd:documentation xml:lang="en">
            The DN list of the trusted voms server credential;
            in the AC part of voms proxy certificate, voms proxy
            certificate comes with the server certificate which is
            used to sign the AC. So when verifying the AC on the
            AC-consuming side (in ARC1, it is the MCCTLS which will
            consumes the AC), the server certificate will be checked
            against a trusted DN list. Only if the DN and issuer's
            DN of server certificate exactly matches the DN list
            in the configuration under TLS component, the AC can be trusted
            </xsd:documentation>
        </xsd:annotation>
        <xsd:sequence>
          <xsd:element name="VOMSCertTrustDN" type="xsd:string" minOccurs="0" maxOccurs="unbounded"/>
          <xsd:element name="VOMSCertTrustRegex" type="xsd:string" minOccurs="0"/>
        </xsd:sequence>
    </xsd:complexType>
</xsd:element>

<xsd:element name="VOMSCertTrustDNChainsLocation" type="xsd:string">
    <xsd:annotation>
        <xsd:documentation xml:lang="en">
        DN list in an external file, which is in the same format as VOMSCertTrustDNChain
        </xsd:documentation>
    </xsd:annotation>
</xsd:element>

<xsd:element name="VOMSProcessing" type="xsd:string">
    <xsd:simpleType>
        <xsd:annotation>
            <xsd:documentation xml:lang="en">
            How to behave if failure happens during VOMS processing.
             relaxed - use everything that passed validation.
             standard - same as relaxed but fail if parsing errors took place and 
                  VOMS extension is marked as critical. This is a default.
             strict - fail if any parsing error was discovered.
             noerrors - fail if any parsing or validation error happened.
            </xsd:documentation>
        </xsd:annotation>
        <xsd:restriction base="xsd:string">
            <xsd:enumeration value="relaxed"/>
            <xsd:enumeration value="standard"/>
            <xsd:enumeration value="strict"/>
            <xsd:enumeration value="noerrors"/>
        </xsd:restriction>
    </xsd:simpleType>
</xsd:element>

<xsd:element name="Handshake" default="TLS">
    <xsd:simpleType>
        <xsd:annotation>
            <xsd:documentation xml:lang="en">
            Type of handshake applied. Default is TLS.
            </xsd:documentation>
        </xsd:annotation>
        <xsd:restriction base="xsd:string">
            <xsd:enumeration value="TLS"/>
            <xsd:enumeration value="SSLv3"/>
        </xsd:restriction>
    </xsd:simpleType>
</xsd:element>

<xsd:element name="GSI" default="">
    <xsd:simpleType>
        <xsd:annotation>
            <xsd:documentation xml:lang="en">
            GSI features to use. Currently only supports Globus 
            without delegation.
            </xsd:documentation>
        </xsd:annotation>
        <xsd:restriction base="xsd:string">
            <xsd:enumeration value=""/>
            <xsd:enumeration value="globus"/>
        </xsd:restriction>
    </xsd:simpleType>
</xsd:element>

<xsd:element name="Encryption" default="">
    <xsd:simpleType>
        <xsd:annotation>
            <xsd:documentation xml:lang="en">
            Encryption level to use. Can choose from 
              required - only ciphers with encryption are allowed (default for client),
              preferred - ciphers with encryption preferred and without encryption allowd (default for server),
              optional - ciphers with encryption allowed but without encryption preferred,
              off - only ciphers without encryption are allowed.
            </xsd:documentation>
        </xsd:annotation>
        <xsd:restriction base="xsd:string">
            <xsd:enumeration value="required"/>
            <xsd:enumeration value="preferred"/>
            <xsd:enumeration value="optional"/>
            <xsd:enumeration value="off"/>
        </xsd:restriction>
    </xsd:simpleType>
</xsd:element>

</xsd:schema>