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/usr/share/arc/schema/tcp.xsd is in libarccommon3v5 5.0.5-1ubuntu1.

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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/tcp/2009/08"
    xmlns="http://www.nordugrid.org/schemas/tcp/2009/08"
    elementFormDefault="qualified"
    attributeFormDefault="unqualified">

<!-- Listen --> 
<xsd:element name="Listen">
    <xsd:complexType>
        <xsd:annotation>
            <xsd:documentation xml:lang="en">
            This element defines listening TCP socket. If interface is missing socket is bound to all local interfaces (not supported). There may be multiple Listen elements.
            </xsd:documentation>
        </xsd:annotation>
        <xsd:sequence>
            <xsd:element name="Interface" type="xsd:string" minOccurs="0" maxOccurs="1" default="0.0.0.0">
                <xsd:annotation>
                    <xsd:documentation xml:lang="en">
                    Listen network interface.
                    </xsd:documentation>
                </xsd:annotation>
            </xsd:element>
            <xsd:element name="Port" type="xsd:int">
                <xsd:annotation>
                    <xsd:documentation xml:lang="en">
                    Listen network port.
                    </xsd:documentation>
                </xsd:annotation>
            </xsd:element>
            <xsd:element name="Version" minOccurs="0" maxOccurs="1">
                <xsd:simpleType>
                    <xsd:annotation>
                        <xsd:documentation xml:lang="en">
                        This element defines TCP/IP protocol version.
                        If not specified both versions will be used whenether possible.
                        </xsd:documentation>
                    </xsd:annotation>
                    <xsd:restriction base="xsd:string">
                        <xsd:enumeration value="4"/>
                        <xsd:enumeration value="6"/>
                    </xsd:restriction>
                </xsd:simpleType>
            </xsd:element>
            <xsd:element name="NoDelay" type="xsd:boolean" minOccurs="0" maxOccurs="1" default="false">
                <xsd:annotation>
                    <xsd:documentation xml:lang="en">
                    Apply no delay socket option. If set to true TCP packets will
                    be proceesd as soon as possible without waiting for more data
                    to become available.
                    </xsd:documentation>
                </xsd:annotation>
            </xsd:element>
            <xsd:element name="Timeout" type="xsd:int" minOccurs="0" maxOccurs="1" default="60">
                <xsd:annotation>
                    <xsd:documentation xml:lang="en">
                    Timeout for socket level operations
                    </xsd:documentation>
                </xsd:annotation>
            </xsd:element>
            <xsd:element name="AllAddresses" type="xsd:boolean" minOccurs="0" maxOccurs="1" default="true">
                <xsd:annotation>
                    <xsd:documentation xml:lang="en">
                    If set to true and MCC fails to bind all addresses of specified interface 
                    then such situation is considered failure. In case value set to false
                    it is enough to bind at least one address of interface.
                    </xsd:documentation>
                </xsd:annotation>
            </xsd:element>
        </xsd:sequence>
    </xsd:complexType>
</xsd:element>

<!-- Connect -->
<xsd:element name="Connect">
    <xsd:complexType>
        <xsd:annotation>
            <xsd:documentation xml:lang="en">
            This element defines TCP connection to be established to specified Host at specified Port. If LocalPort is defined TCP socket will be bound to this port number (not supported).
            </xsd:documentation>
        </xsd:annotation>
        <xsd:sequence>
            <xsd:element name="Host" type="xsd:string"/>
            <xsd:element name="Port" type="xsd:int"/>
            <xsd:element name="Timeout" type="xsd:int"/>
        </xsd:sequence>
    </xsd:complexType>
</xsd:element>

<xsd:element name="Limit">
    <xsd:complexType>
        <xsd:annotation>
            <xsd:documentation xml:lang="en">
            This element defines upper limit for number of simultaneous 
            active TCP connections. Only positive numbers are meaningful.
            If attribute "drop" is specified and is set to true then
            connections over specified limit will be dropped. Otherwise
            they will be put on hold.
            </xsd:documentation>
        </xsd:annotation>
        <xsd:simpleContent>
            <xsd:extension base="xsd:int">
                <xsd:attribute name="drop" type="xsd:boolean" use="optional"/>
            </xsd:extension>
        </xsd:simpleContent>
    </xsd:complexType>
</xsd:element>

</xsd:schema>