<schema 
        xmlns="http://www.w3.org/2001/XMLSchema"
        xmlns:mi="http://fedoraproject.org/metadata/moduleindex"
        targetNamespace="http://fedoraproject.org/metadata/moduleindex"
        elementFormDefault="qualified">
    <annotation>
        <documentation xml:lang="en">
            XML serialization for modular metadata
            &lt;https://docs.fedoraproject.org/en-US/modularity/&gt; stored in
            YUM repositories and interpreted by RPM package managers.
        </documentation>
    </annotation>

    <simpleType name="identifierOrEmpty">
        <annotation>
            <documentation xml:lang="en">
                A user-visible, non-empty string used as a name for a module,
                a stream, or a profile.
                An empty value means unsetting that relation (e.g. unsetting a
                default stream).
            </documentation>
        </annotation>
        <restriction base="string">
            <pattern value="[a-zA-Z0-9+._-]*"/>
            <maxLength value="255"/>
        </restriction>
    </simpleType>

    <simpleType name="identifier">
        <annotation>
            <documentation xml:lang="en">
                A user-visible, non-empty string used as a name for a module,
                a stream, and an architecture.
            </documentation>
        </annotation>
        <restriction base="mi:identifierOrEmpty">
            <minLength value="1"/>
        </restriction>
    </simpleType>

    <simpleType name="singleLine">
        <annotation>
            <documentation xml:lang="en">
                A string without line-feed, carriage-return, and tab characters.
                Intended for short, user visible texts. Empty value is possible.
            </documentation>
        </annotation>
        <restriction base="string">
            <pattern value="[^\t\r\n]*"/>
        </restriction>
    </simpleType>

    <simpleType name="multiLine">
        <annotation>
            <documentation xml:lang="en">
                A possibly long, multi-line text. End of lines are
                encoded as line-feeds (U+000A). Empty value is possible.
            </documentation>
        </annotation>
        <restriction base="string"/>
    </simpleType>

    <simpleType name="license">
        <annotation>
            <documentation xml:lang="en">
                A non-empty license expression. An exact syntax and semantics
                depends on the targetted distribution. E.g. Fedora and derived
                distributions follow
                &lt;https://docs.fedoraproject.org/en-US/legal/license-field/&gt;.
            </documentation>
        </annotation>
        <restriction base="mi:singleLine">
            <minLength value="1"/>
        </restriction>
    </simpleType>

    <simpleType name="packageName">
        <annotation>
            <documentation xml:lang="en">
                An RPM package name. A non-empty string accepted by rpm tool
                as a package name. A value with ".." substring is forbiden.
            </documentation>
        </annotation>
        <restriction base="string">
            <pattern value="[a-zA-Z0-9_%][a-zA-Z0-9._+%{}-]*"/>
            <maxLength value="255"/>
        </restriction>
    </simpleType>

    <simpleType name="rpmVersion">
        <annotation>
            <documentation xml:lang="en">
                An RPM version string. A non-empty string accepted by rpm tool
                as a package version or a package release. A value with ".."
                substring is forbiden.
            </documentation>
        </annotation>
        <restriction base="string">
            <pattern value="[a-zA-Z0-9._+%{}~^]{1,}"/>
            <maxLength value="255"/>
        </restriction>
    </simpleType>

    <simpleType name="rpmArch">
        <annotation>
            <documentation xml:lang="en">
                An RPM and module architecture string. A non-empty string
                accepted by rpm as an architecture.
            </documentation>
        </annotation>
        <restriction base="mi:identifier"/>
    </simpleType>

    <simpleType name="sha256Type">
        <annotation>
            <documentation xml:lang="en">
                An SHA-256 digest.
            </documentation>
        </annotation>
        <restriction base="hexBinary">
            <length value="32"/>
        </restriction>
    </simpleType>

    <simpleType name="sha512Type">
        <annotation>
            <documentation xml:lang="en">
                An SHA-512 digest.
            </documentation>
        </annotation>
        <restriction base="hexBinary">
            <length value="64"/>
        </restriction>
    </simpleType>

    <simpleType name="contextOrEmptyType">
        <annotation>
            <documentation xml:lang="en">
                A context identifier of a module. A context distinguishes
                flavours of stream. The flavours usually differ by module
                dependencies. It can be used for building the same piece of
                software against different versions of a library or a
                programming language. Or simply for different releases of a
                distribution.
                An empty value means no context, not specific to a context.
            </documentation>
        </annotation>
        <restriction base="string">
            <minLength value="0"/>
            <maxLength value="13"/>
            <pattern value="[a-zA-Z0-9_]*"/>
        </restriction>
    </simpleType>

    <simpleType name="contextType">
        <annotation>
            <documentation xml:lang="en">
                A context identifier of a module. A context distinguishes
                flavours of stream. The flavours usually differ by module
                dependencies. It can be used for building the same piece of
                software against different versions of a library or a
                programming language. Or simply for different releases of a
                distribution.
            </documentation>
        </annotation>
        <restriction base="mi:contextOrEmptyType">
            <minLength value="1"/>
        </restriction>
    </simpleType>

    <simpleType name="timestamp">
        <annotation>
            <documentation xml:lang="en">
                A timestamp expressed as a number of seconds since the
                beginning of Unix epoch.
            </documentation>
        </annotation>
        <restriction base="unsignedLong"/>
    </simpleType>

    <simpleType name="intentName">
        <annotation>
            <documentation xml:lang="en">
                An identifier of an intent. An empty string denotes other intents.
            </documentation>
        </annotation>
        <restriction base="string">
            <minLength value="0"/>
            <maxLength value="255"/>
        </restriction>
    </simpleType>

    <simpleType name="localeName">
        <annotation>
            <documentation xml:lang="en">
                An identifier of a locale according to GNU libc.
                I.e. a 2-letter (or 3-letter if 2-letter code is not
                available) ISO 639 language code, optionally followed by
                an underscore and a 2-letter ISO 3166 country code, optionally
                followed by a commercial at and a modifier (variant) code.
                E.g. "sr", "sr_RS", "sr@latin", or "sr_RS@latin".
                (A codeset character set is not used here because it's
                implicit from the XML character set.) See setlocale(3)
                manual and gettexts info pages.
                To ensure a canonical form, here the language code must be
                lower-cased, the country code upper-cased and the modifier
                code lower-cased.
            </documentation>
        </annotation>
        <restriction base="string">
            <pattern value="[a-z]{2,3}(_[A-Z]{2})?(@[a-z]+)?"/>
        </restriction>
    </simpleType>

    <complexType name="dependencyType">
        <annotation>
            <documentation xml:lang="en">
                A dependency on another module.
            </documentation>
        </annotation>
        <sequence>
            <element name="requires" type="mi:identifier" minOccurs="0" maxOccurs="unbounded">
                <annotation>
                    <documentation xml:lang="en">
                        A stream of the module which also must be enabled by
                        the package manager. If this element exists multiple
                        times, any of these streams satisfy. It this element
                        does not exist, any stream satisfies.
                    </documentation>
                </annotation>
            </element>
            <element name="conflicts" type="mi:identifierOrEmpty" minOccurs="0" maxOccurs="unbounded">
                <annotation>
                    <documentation xml:lang="en">
                        A stream of the module which must not be enabled by
                        the package manager. If this element exists multiple
                        times, none of these streams must be enabled. It this
                        element is empty, no stream of the module must be
                        enabled. If a stream is defined to conflict and to be
                        required at the same time, the stream will conflict.
                    </documentation>
                </annotation>
            </element>
        </sequence>
        <attribute name="name" type="mi:identifier" use="required">
            <annotation>
                <documentation xml:lang="en">
                    A name of the module this build depends on.
                </documentation>
            </annotation>
        </attribute>
    </complexType>

    <complexType name="dependencies-andType">
        <annotation>
            <documentation xml:lang="en">
                A module build must satisfy all dependencies listed here.
            </documentation>
        </annotation>
        <sequence>
            <element name="dependency" type="mi:dependencyType" maxOccurs="unbounded"/>
        </sequence>
    </complexType>

    <complexType name="dependencies-orType">
        <annotation>
            <documentation xml:lang="en">
                A module build must satisfy at least one dependencies-and set
                of dependencies.
            </documentation>
        </annotation>
        <sequence>
            <element name="dependencies-and" type="mi:dependencies-andType" maxOccurs="unbounded"/>
        </sequence>
    </complexType>

    <complexType name="servicelevelType">
        <annotation>
            <documentation xml:lang="en">
                When this particular support level ends for for this
                stream. The support includes that date, it becomes void the
                next day.
            </documentation>
        </annotation>
        <attribute name="name" type="mi:identifier" use="required">
            <annotation>
                <documentation xml:lang="en">
                    An identifier for this service level.
                </documentation>
            </annotation>
        </attribute>
        <attribute name="end" type="mi:timestamp" use="required">
            <annotation>
                <documentation xml:lang="en">
                    A time after which the support level does not exist.
                </documentation>
            </annotation>
        </attribute>
    </complexType>

    <complexType name="licenseType">
        <annotation>
            <documentation xml:lang="en">
                Licenses pertaining this stream.
            </documentation>
        </annotation>
        <sequence>
            <element name="module" type="mi:license" maxOccurs="unbounded">
                <annotation>
                    <documentation xml:lang="en">
                        A license of the modular metadata. Multiple elements
                        imply a logical AND.
                    </documentation>
                </annotation>
            </element>
            <element name="content" type="mi:license" minOccurs="0" maxOccurs="unbounded">
                <annotation>
                    <documentation xml:lang="en">
                        A license of the RPM packages. Multiple elements
                        imply a logical AND.
                    </documentation>
                </annotation>
            </element>
        </sequence>
    </complexType>

    <complexType name="referencesType">
        <annotation>
            <documentation xml:lang="en">
                Links to (usually upstream) places pertaining the packaged software.
            </documentation>
        </annotation>
        <attribute name="community" type="anyURI">
            <annotation>
                <documentation xml:lang="en">A home page.</documentation>
            </annotation>
        </attribute>
        <attribute name="documentation" type="anyURI">
            <annotation>
                <documentation xml:lang="en">A documentation.</documentation>
            </annotation>
        </attribute>
        <attribute name="tracker" type="anyURI">
            <annotation>
                <documentation xml:lang="en">A feature and bug tracking system.</documentation>
            </annotation>
        </attribute>
    </complexType>

    <complexType name="profileType">
        <annotation>
            <documentation xml:lang="en">
                A profile of the stream is a group of packages which can be
                installed by passing the profile name to a package manager.
            </documentation>
        </annotation>
        <sequence>
            <element name="package" type="mi:packageName" minOccurs="0" maxOccurs="unbounded"/>
        </sequence>
        <attribute name="name" type="mi:identifier" use="required">
            <annotation>
                <documentation xml:lang="en">
                    An identifier of the profile. It must be unique in the
                    build. It's scope is a stream of the build.
                </documentation>
            </annotation>
        </attribute>
        <attribute name="description" type="mi:multiLine">
            <annotation>
                <documentation xml:lang="en">
                    An explanation of the profile.
                </documentation>
            </annotation>
        </attribute>
    </complexType>

    <complexType name="nevraType">
        <annotation>
            <documentation xml:lang="en">
                An RPM package which belongs to this stream.
            </documentation>
        </annotation>
        <attribute name="name" type="mi:packageName" use="required">
            <annotation>
                <documentation xml:lang="en">
                    A name of the RPM package.
                </documentation>
            </annotation>
        </attribute>
        <attribute name="epoch" type="unsignedInt" use="required">
            <annotation>
                <documentation xml:lang="en">
                    An epoch number of the RPM package. If the
                    package seems having no epoch, it's implicit 0.
                </documentation>
            </annotation>
        </attribute>
        <attribute name="version" type="mi:rpmVersion" use="required">
            <annotation>
                <documentation xml:lang="en">
                    A version of the RPM package.
                </documentation>
            </annotation>
        </attribute>
        <attribute name="release" type="mi:rpmVersion" use="required">
            <annotation>
                <documentation xml:lang="en">
                    A release of the RPM package.
                </documentation>
            </annotation>
        </attribute>
        <attribute name="arch" type="mi:rpmArch" use="required">
            <annotation>
                <documentation xml:lang="en">
                    An architecture of the RPM package. Source packages
                    have a distinct value.
                </documentation>
            </annotation>
        </attribute>
        <attribute name="sha256" type="mi:sha256Type">
            <annotation>
                <documentation xml:lang="en">
                    An optional SHA-256 digest of a content of the RPM package
                    file.
                </documentation>
            </annotation>
        </attribute>
        <attribute name="sha512" type="mi:sha512Type">
            <annotation>
                <documentation xml:lang="en">
                    An optional SHA-512 digest of a content of the RPM package
                    file.
                </documentation>
            </annotation>
        </attribute>
    </complexType>

    <complexType name="buildType">
        <annotation>
            <documentation xml:lang="en">
                A set of RPM packages which were built together as a
                functional unit and metadata about them.
            </documentation>
        </annotation>
        <sequence>
            <element name="dependencies-or" type="mi:dependencies-orType" minOccurs="0"/>
            <element name="servicelevel" type="mi:servicelevelType" minOccurs="0" maxOccurs="unbounded"/>
            <element name="license" type="mi:licenseType">
                <unique name="licenseModule">
                    <selector xpath="mi:module"/>
                    <field xpath="."/>
                </unique>
                <unique name="licenseContent">
                    <selector xpath="mi:content"/>
                    <field xpath="."/>
                </unique>
            </element>
            <element name="references" type="mi:referencesType" minOccurs="0"/>
            <element name="profile" type="mi:profileType" minOccurs="0" maxOccurs="unbounded">
                <unique name="profilePackage">
                    <selector xpath="mi:package"/>
                    <field xpath="."/>
                </unique>
            </element>
            <element name="api" type="mi:packageName" minOccurs="0" maxOccurs="unbounded">
                <annotation>
                    <documentation xml:lang="en">
                        A binary package name which is intended for a use and
                        its interface (name, file names, API, etc.) is
                        guaranteed to remain stable and compatible for the
                        whole life of this stream.
                    </documentation>
                </annotation>
            </element>
            <element name="demodularized" type="mi:packageName" minOccurs="0" maxOccurs="unbounded">
                <annotation>
                    <documentation xml:lang="en">
                        A binary package name which used to be part of this
                        stream (in the older versions) but not anymore and
                        a package manager should stop hiding the same named
                        nonmodular packages. That is make the same-name
                        nonmodular packages available again.
                    </documentation>
                </annotation>
            </element>
            <element name="nevra" type="mi:nevraType" minOccurs="0" maxOccurs="unbounded"/>
        </sequence>
        <attribute name="version" type="unsignedLong" use="required">
            <annotation>
                <documentation xml:lang="en">
                    A version of a build of stream. A package manager uses a
                    build with the highest version in a particular context and
                    architecture with satisfied dependencies to obtain
                    user-visible data, like a stream description or profiles.
                    The only exception are RPM packages (nevra elements) which
                    are gathered over all versions of the given stream,
                    context, and architecture.
                    To speed up processing, producers are advised to sort
                    builds by version in numerical, descending order.
                </documentation>
            </annotation>
        </attribute>
        <attribute name="context" type="mi:contextType" use="required">
            <annotation>
                <documentation xml:lang="en">
                    A context of a build of a a stream. A context distinguishes
                    flavours of stream. The flavours usually differ by modular
                    dependencies. It can be used for building the same piece of
                    software against different versions of a library or a
                    programming language. Or simply for different releases of a
                    distribution.
                    If "static" attribute is true, the context value identifies
                    an upgrade path (sorted by a version) which a package
                    manager follows to upgrade from one module build to
                    another.
                    If "static" attribute is false, the upgrade path is build
                    from module builds whose dependencies are the same.
                </documentation>
            </annotation>
        </attribute>
        <attribute name="static" type="boolean" default="false">
            <annotation>
                <documentation xml:lang="en">
                    If this attribute is true, the context value identifies
                    an upgrade path (sorted by a version) which a package
                    manager follows to upgrade from one module build to
                    another.
                    If this attribute is false, the upgrade path is build
                    from module builds whose dependencies are the same
                    regardless of the context.
                </documentation>
            </annotation>
        </attribute>
        <attribute name="arch" type="mi:rpmArch" use="required">
            <annotation>
                <documentation xml:lang="en">
                    An architecture of the module build.
                </documentation>
            </annotation>
        </attribute>
        <attribute name="summary" type="mi:singleLine" default="">
            <annotation>
                <documentation xml:lang="en">
                    A short, one-line, description of the stream.
                </documentation>
            </annotation>
        </attribute>
        <attribute name="description" type="mi:multiLine" default="">
            <annotation>
                <documentation xml:lang="en">
                    A long, multi-line description of the stream.
                </documentation>
            </annotation>
        </attribute>
    </complexType>

    <complexType name="profileIntentType">
        <annotation>
            <documentation xml:lang="en">
                A set of default profiles for this particular intent.
                When merging default-profile intents, the latest tree replaces
                all previous definitions atomically.
            </documentation>
        </annotation>
        <sequence>
            <element name="profile" type="mi:identifier" minOccurs="0" maxOccurs="unbounded">
                <annotation>
                    <documentation xml:lang="en">
                        Each occurrence sets this profile as a default one.
                        Multiple occurrences creates a list of default profiles.
                        No occurrence empties the list of the default profiles.
                    </documentation>
                </annotation>
            </element>
        </sequence>
        <attribute name="name" type="mi:intentName" default="">
            <annotation>
                <documentation xml:lang="en">
                    An identifier of the intent. A missing or empty attribute
                    means a global default applying to other unspecified
                    intents.
                </documentation>
            </annotation>
        </attribute>
    </complexType>

    <complexType name="default-profileType">
        <annotation>
            <documentation xml:lang="en">
                Specify a list of profiles to be installed by a package
                manager when a stream is requested to be installed without
                specifying a particular profile. The default profiles can
                differ by a variant of a distribution, called intent here.
            </documentation>
        </annotation>
        <sequence>
            <element name="intent" type="mi:profileIntentType" maxOccurs="unbounded">
                <unique name="defaultProfileList">
                    <selector xpath="mi:profile"/>
                    <field xpath="."/>
                </unique>
            </element>
        </sequence>
        <attribute name="modified" type="mi:timestamp" use="required">
            <annotation>
                <documentation xml:lang="en">
                    When merging default-profiles from multiple indices, all
                    default-profiles apply cumulatively in the ascending order
                    of this attribute.
                </documentation>
            </annotation>
        </attribute>
    </complexType>

    <complexType name="replacementType">
        <annotation>
            <documentation xml:lang="en">
                A module stream identification.
            </documentation>
        </annotation>
        <attribute name="module" type="mi:identifier"/>
        <attribute name="stream" type="mi:identifier"/>
    </complexType>

    <complexType name="eolType">
        <annotation>
            <documentation xml:lang="en">
                An end of life of a stream.
            </documentation>
        </annotation>
        <sequence>
            <element name="replacement" type="mi:replacementType" minOccurs="0">
                <annotation>
                    <documentation xml:lang="en">
                        If this element exists, it defines a new stream which
                        replaces the obsoleted one. A package manager should
                        offer a user to upgrade to that new stream.
                    </documentation>
                </annotation>
            </element>
        </sequence>
        <attribute name="when" type="mi:timestamp">
            <annotation>
                <documentation xml:lang="en">
                    If the attribute exists, it's the furthest time when the
                    stream/context is supported. After that time the
                    stream/context becomes obsolete and a package manager
                    should warn about it.
                    If the attribute doesn't exist, it means it's obsolete
                    right now.
                </documentation>
            </annotation>
        </attribute>
        <attribute name="message" type="mi:multiLine" default="">
            <annotation>
                <documentation xml:lang="en">
                    A user visible explanation. It can carry a reason or
                    instructions for the upgrade.
                </documentation>
            </annotation>
        </attribute>
    </complexType>

    <complexType name="obsoleteType">
        <annotation>
            <documentation xml:lang="en">
                Define an end of life of a stream or an end of life of a
                specific context of the stream. It optionally can point to a
                replacement.
            </documentation>
        </annotation>
        <sequence>
            <element name="eol" type="mi:eolType" minOccurs="0">
                <annotation>
                    <documentation xml:lang="en">
                        If this element exists, it defines an end of life of the
                        (context of the) stream. Otherwise, the (context of
                        the) stream will be unobsoleted. I.e.:
                        If this is a context-nonspecific reset, it cancels
                        obsoleteness for all contexts.
                        If this is a context-specific reset, it only cancels
                        obsoleteness of the specific context.
                    </documentation>
                </annotation>
            </element>
        </sequence>
        <attribute name="modified" type="mi:timestamp" use="required">
            <annotation>
                <documentation xml:lang="en">
                    When merging context-nonspecific obsoletes from multiple
                    indices, the latest obsolete definition according to this
                    attribute overrides older definitions, including resets,
                    including context-specific definitions.
                    When merging context-specific obsoletes, the same rule
                    applies to obsoletes of that context. Later
                    context-specific obsolete overrides former context-specific
                    definitions, and overrides context-nonspecific definition
                    for that context.
                    I.e., having a context-specific obsolete not older than a
                    nonspecific one retains the nonspecific one and in
                    addition overrides the specified context. Contrary, having
                    a context-nonspecific obsolete newer makes the previous
                    context-specific obsolete void.
                    If there are both context-nonspecific and
                    context-specific obsoletes with the same modified
                    timestamp, first the nonspecific one is applied and then
                    the specific one is applied.
                </documentation>
            </annotation>
        </attribute>
        <attribute name="context" type="mi:contextOrEmptyType" default="">
            <annotation>
                <documentation xml:lang="en">
                    If this attribute exists and is nonempty, the obsolete
                    pertains only module builds of that static context of this
                    stream. It cannot apply to builds with a nonstatic context.
                    Otherwise, the obsolete pertains all contexts of this stream.
                </documentation>
            </annotation>
        </attribute>
    </complexType>

    <complexType name="buildTranslation">
        <annotation>
            <documentation xml:lang="en">
                A translatation of a module stream.
            </documentation>
        </annotation>
        <attribute name="summary" type="mi:singleLine">
            <annotation>
                <documentation xml:lang="en">
                    A translation for a /index/module/stream/build/@summary.
                    If missing, unsets.
                </documentation>
            </annotation>
        </attribute>
        <attribute name="description" type="mi:multiLine">
            <annotation>
                <documentation xml:lang="en">
                    A translation for a /index/module/stream/build/@description.
                    If missing, unsets.
                </documentation>
            </annotation>
        </attribute>
    </complexType>

    <complexType name="profileTranslation">
        <annotation>
            <documentation xml:lang="en">
                A translation of a profile description.
            </documentation>
        </annotation>
        <attribute name="name" type="mi:identifier" use="required">
            <annotation>
                <documentation xml:lang="en">
                    An identifier of the profile. It must be unique in the stream.
                </documentation>
            </annotation>
        </attribute>
        <attribute name="description" type="mi:multiLine">
            <annotation>
                <documentation xml:lang="en">
                    A translation for /index/module/stream/build/profile/@description.
                    If missing, unsets.
                </documentation>
            </annotation>
        </attribute>
    </complexType>

    <complexType name="obsoleteTranslation">
        <annotation>
            <documentation xml:lang="en">
                A translation of an obsolete message.
            </documentation>
        </annotation>
        <attribute name="context" type="mi:contextOrEmptyType" default="">
            <annotation>
                <documentation xml:lang="en">
                    If this attribute is nonempty, this translation pertains
                    obsoletes of only that context. Otherwise, it pertains
                    obsoletes nonspecific to a context.
                </documentation>
            </annotation>
        </attribute>
        <attribute name="message" type="mi:multiLine">
            <annotation>
                <documentation xml:lang="en">
                    A translation for /index/module/stream/obsolete/@message.
                    If missing, unsets.
                </documentation>
            </annotation>
        </attribute>
    </complexType>

    <complexType name="localeType">
        <annotation>
            <documentation xml:lang="en">
                The translated strings into a particular language.
                It's a sequence of translations for a build, profiles, and
                obsoletes. Each of them is optional, but at at least one must
                be specified.
                A translation of a build applies to all builds of that stream.
                Hence the sequence can contain at most one build translation.
                A translation of a profile applies to the named profile. Hence
                the sequence can contain multiple profile translations.
                A translation without naming a context applies to the
                context-nonspecific obsolete.
                A translation naming a context applies to the context-specific
                obsolete. Hence the sequence can contain multiple obsolete
                translatations.
            </documentation>
        </annotation>
        <choice>
            <sequence>
                <element name="build" type="mi:buildTranslation" minOccurs="1"/>
                <element name="profile" type="mi:profileTranslation" minOccurs="0" maxOccurs="unbounded"/>
                <element name="obsolete" type="mi:obsoleteTranslation" minOccurs="0" maxOccurs="unbounded"/>
            </sequence>
            <sequence>
                <element name="profile" type="mi:profileTranslation" minOccurs="1" maxOccurs="unbounded"/>
                <element name="obsolete" type="mi:obsoleteTranslation" minOccurs="0" maxOccurs="unbounded"/>
            </sequence>
            <sequence>
                <element name="obsolete" type="mi:obsoleteTranslation" minOccurs="1" maxOccurs="unbounded"/>
            </sequence>
        </choice>
        <attribute name="name" type="mi:localeName" use="required">
            <annotation>
                <documentation xml:lang="en">
                    A locale identifier according to GNU libc. Without
                    a codeset part.
                </documentation>
            </annotation>
        </attribute>
    </complexType>

    <complexType name="translationType">
        <annotation>
            <documentation xml:lang="en">
                Translated user-visible messages and descriptions pertaining a
                stream.
            </documentation>
        </annotation>
        <sequence>
            <element name="locale" type="mi:localeType" maxOccurs="unbounded">
                <unique name="localeProfile">
                    <selector xpath="mi:profile"/>
                    <field xpath="@name"/>
                </unique>
                <unique name="localeObsolete">
                    <selector xpath="mi:obsolete"/>
                    <field xpath="@context"/>
                </unique>
            </element>
        </sequence>
        <attribute name="modified" type="mi:timestamp" use="required">
            <annotation>
                <documentation xml:lang="en">
                    When merging translations from multiple indices,
                    translations accumulate and newer, according to this
                    attribute, translated builds, profiles, and obsoletes replace
                    older ones, independently.
                </documentation>
            </annotation>
        </attribute>
    </complexType>

    <complexType name="streamType">
        <annotation>
            <documentation xml:lang="en">
                A stream is a version, a release, a variant of a software. It
                is identified by an in-module unique, short, identifier-like
                name. A module-stream pair is globally unique. Streams of a single
                module are mutually exclusive for an installation.
            </documentation>
        </annotation>
        <sequence>
            <element name="build" type="mi:buildType" minOccurs="0" maxOccurs="unbounded">
                <unique name="servicelevelName">
                    <selector xpath="mi:servicelevel"/>
                    <field xpath="@name"/>
                </unique>
                <unique name="buildProfile">
                    <selector xpath="mi:profile"/>
                    <field xpath="@name"/>
                </unique>
            </element>
            <element name="default-profile" type="mi:default-profileType" minOccurs="0">
                <unique name="profileIntent">
                    <selector xpath="mi:intent"/>
                    <field xpath="@name"/>
                </unique>
            </element>
            <element name="obsolete" type="mi:obsoleteType" minOccurs="0" maxOccurs="unbounded"/>
            <element name="translation" type="mi:translationType" minOccurs="0">
                <unique name="translationLocale">
                    <selector xpath="mi:locale"/>
                    <field xpath="@name"/>
                </unique>
            </element>
        </sequence>
        <attribute name="name" type="mi:identifier" use="required"/>
    </complexType>

    <complexType name="streamIntentType">
        <annotation>
            <documentation xml:lang="en">
                A default stream for this particular intent.
                When merging default-streams, the latest tree replaces all
                previous definitions atomically.
            </documentation>
        </annotation>
        <attribute name="name" type="mi:intentName" default="">
            <annotation>
                <documentation xml:lang="en">
                    An identifier of the intent. An empty or missing attribute
                    means a global default applying to other unspecified
                    intents. The value must be unique.
                </documentation>
            </annotation>
        </attribute>
        <attribute name="stream" type="mi:identifierOrEmpty" default="">
            <annotation>
                <documentation xml:lang="en">
                    An identifier of the default stream. An empty or missing
                    attribute means unsetting the, possibly previously
                    defined, default stream.
                </documentation>
            </annotation>
        </attribute>
    </complexType>

    <complexType name="default-streamType">
        <annotation>
            <documentation xml:lang="en">
                A stream of the module a package manager prefers when a user
                request to install a module without specifying a particular
                stream. The default stream can vary according to a variant of
                a distribution the user has installed. The variant is called
                an intent here.
            </documentation>
        </annotation>
        <sequence>
            <element name="intent" type="mi:streamIntentType" maxOccurs="unbounded"/>
        </sequence>
        <attribute name="modified" type="mi:timestamp" use="required">
            <annotation>
                <documentation xml:lang="en">
                    When merging default-streams from multiple indices, all
                    default-streams apply cumulatively in the ascending order
                    of this attribute.
                </documentation>
            </annotation>
        </attribute>
    </complexType>

    <complexType name="moduleType">
        <annotation>
            <documentation xml:lang="en">
                A module is a collection of RPM packages constituting a particular
                software. It is identified by a unique, short, identifier-like
                name.
            </documentation>
        </annotation>
        <sequence>
            <element name="stream" type="mi:streamType" minOccurs="0" maxOccurs="unbounded">
                <unique name="obsoleteContext">
                    <selector xpath="mi:obsolete"/>
                    <field xpath="@context"/>
                </unique>
            </element>
            <element name="default-stream" type="mi:default-streamType" minOccurs="0" maxOccurs="unbounded">
                <unique name="default-streamIntent">
                    <selector xpath="mi:intent"/>
                    <field xpath="@name"/>
                </unique>
            </element>
        </sequence>
        <attribute name="name" type="mi:identifier" use="required"/>
    </complexType>

    <element name="index">
        <annotation>
            <documentation xml:lang="en">
                A root element for all modular metadata.
            </documentation>
        </annotation>
        <complexType>
            <sequence>
                <element name="module" type="mi:moduleType" minOccurs="0" maxOccurs="unbounded">
                    <unique name="streamName">
                        <selector xpath="mi:stream"/>
                        <field xpath="@name">
                            <annotation>
                                <documentation xml:lang="en">
                                    To speed up processing, producers are
                                    advised to sort streams by names in
                                    lexicographical, ascending order.
                                </documentation>
                            </annotation>
                        </field>
                    </unique>
                </element>
            </sequence>
            <attribute name="version" type="nonNegativeInteger" use="required" fixed="1">
                <annotation>
                    <documentation xml:lang="en">
                        A major version of this index format. Future
                        incompatible versions of the format will have a
                        distinct version number.
                        Implementations which do not support this version are
                        advised to reject documents of this version.
                    </documentation>
                </annotation>
            </attribute>
            <attribute name="revision" type="nonNegativeInteger" use="required" fixed="0">
                <annotation>
                    <documentation xml:lang="en">
                        A minor revision of this index format version. Future
                        compatible revisions of the format will have
                        a distinct revsion number, but retain unchanged major
                        version number.
                        Implementations which do not support this revision,
                        but support the major version are advised to process
                        the document.
                        Consuming implementations are not advised to validate
                        the input documents against this XML schema because
                        this schema only fits to this revision and performs
                        a strict validation.
                    </documentation>
                </annotation>
            </attribute>
        </complexType>
        <unique name="moduleName">
            <selector xpath="mi:module"/>
            <field xpath="@name">
                <annotation>
                    <documentation xml:lang="en">
                        To speed up processing, producers are
                        advised to sort modules by names in
                        lexicographical, ascending order.
                    </documentation>
                </annotation>
            </field>
        </unique>
    </element>
</schema>