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https://issues.apache.org/jira/browse/FELIX-2357?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12871771#action_12871771
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Łukasz Dywicki commented on FELIX-2357:
---------------------------------------

{code}<?xml version="1.0" encoding="UTF-8"?>
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<xs:schema elementFormDefault='qualified'
    targetNamespace='http://felix.apache.org/karaf/xmlns/features/v1.0.0'
    xmlns:xs='http://www.w3.org/2001/XMLSchema'
    xmlns:tns='http://felix.apache.org/karaf/xmlns/features/v1.0.0'>

    <xs:complexType name="featuresRoot">
        <xs:sequence>
            <xs:element name="repository" type="xs:string" minOccurs="0" 
maxOccurs="0" />
            <xs:element name="feature" type="tns:feature" maxOccurs="unbounded" 
/>
        </xs:sequence>
    </xs:complexType>

    <xs:complexType name="feature">
        <xs:choice minOccurs="0" maxOccurs="unbounded">
            <xs:element name="feature" type="tns:dependency" />
            <xs:element name="bundle" type="xs:anyURI" />
            <xs:element name="config" type="tns:config" />
        </xs:choice>
        <xs:attribute name="name" type="tns:featureName" use="required" />
        <xs:attribute name="version" type="xs:string" default="0.0.0" />
    </xs:complexType>

    <xs:complexType name="dependency">
        <xs:simpleContent>
            <xs:extension base="tns:featureName">
                <xs:attribute name="version" type="xs:string" default="0.0.0" />
            </xs:extension>
        </xs:simpleContent>
    </xs:complexType>

    <xs:complexType name="config">
        <xs:simpleContent>
            <xs:extension base="xs:string">
                <xs:attribute name="name" type="xs:string" />
            </xs:extension>
        </xs:simpleContent>
    </xs:complexType>

    <xs:simpleType name="featureName">
        <xs:restriction base="xs:string">
            <xs:minLength value="1" />
        </xs:restriction>
    </xs:simpleType>

    <xs:element name="features" type="tns:featuresRoot" />

</xs:schema>{code}

Schema proposal.

> Provide XML Schema for feature descriptors and support it's validation
> ----------------------------------------------------------------------
>
>                 Key: FELIX-2357
>                 URL: https://issues.apache.org/jira/browse/FELIX-2357
>             Project: Felix
>          Issue Type: Improvement
>          Components: Karaf
>    Affects Versions: karaf-1.0.0, karaf-1.2.0, karaf-1.4.0
>            Reporter: Łukasz Dywicki
>
> Current version of feature service does not validate structure of document. 
> It would be nice to add XML Schema from next reasons:
> - better tooling in IDEs
> - less mistakes
> - semantic correctness

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