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RESTful Service Description Language

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XML description of HTTP-based web APIs
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The RESTful Service Description Language (RSDL) is a machine- and human-readable XML description of HTTP-based web applications (typically REST web services).[1]

The language (defined by Michael Pasternak during his work on oVirt RESTful API) allows documenting the model of the resource(s) provided by a service, the relationships between them, and operations and the parameters that must be supplied for the operations. It specifies whether parameters are mandated; and describes possible overloads as parameters sets.

RSDL is intended to simplify the reuse of web services that are based on the HTTP architecture of the web. It is platform- and language-independent and aims to promote reuse of applications beyond the basic use in a web browser by both humans and machines.

Unlike WADL, it concentrates on describing URIs as stand-alone entry points in to the application which can be invoked in different ways, does not require traversing over URI components to figure out URI structure, and supports URI/Headers/body parameters overloads. This makes it human-readable and easily consumed by both humans and machines.

Properties

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  • Self descriptive: RSDL represents different URIs as stand-alone entry points into the application. Following resource URIs, one can figure out which methods are available for the given resources and how those resources can be consumed.
  • Machine-readable: Each URI in RSDL contains all the necessary information to generate an HTTP request from it, which can be easily consumed by accessing the URI internals.
  • Human-readable: Each URI in RSDL contains "rel" and "description" attributes describing the meaning of the given operation on that URI. Humans can easily fetch all available operations for a given collection/resource simply by locating different descriptors within the same URI.

Format

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<rsdlrel="rsdl"href="/api?rsdl">
<description/>
<versionrevision="0"build="0"minor="0"major="0"/>
<schemarel="schema"href="/api?schema">
<name>api.xsd</name>
<description/>
</schema>
<generalrel="*"href="/*">
<request>
<headers>
<headerrequired="true|false">
<name/>
<description/>
<value/>
</header>
</headers>
<url>
<parameters_set>
<parametercontext="query|matrix"type="xs:string"
required="true|false">
<name/>
<value/>
</parameter>
</parameters_set>
</url>
</request>
<name/>
<description/>
</general>
<links>
<linkrel="get|..."href="/api/xxx">
<request>
<http_method>GET|POST|PUT|DELETE|...</http_method>
<headers>
<headerrequired="true|false">
<name/>
<value/>
</header>
</headers>
<url>
<parameters_set>
<parametercontext="query|matrix"type=""
required="true|false">
<name/>
<value/>
</parameter>
</parameters_set>
</url>
<body>
<type>...</type>
<parameters_set>
<parametertype=""required="true|false">
<name>FQ-name-to-parameter</name>
</parameter>
</parameters_set>
</body>
</request>
<response>
<type/>
</response>
</link>
</links>
</rsdl>

Components

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URI

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<links>
<linkrel="get|..."href="/api/xxx">

Request

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<request>
<http_method>GET|POST|PUT|DELETE|...</http_method>
<headers>
<headerrequired="true|false">
<name></name>
<value></value>
</header>
...
</headers>
<url>
<parameters_set>
<parametercontext="query|matrix"type=""required="true|false">
<name></name>
<value></value>
</parameter>
...
</parameters_set>
...
</url>
<body>
<type>...</type>
<parameters_set>
<parametertype=""required="true|false">
<name>FQ-name-to-parameter</name>
</parameter>
...
</parameters_set>
...
</body>
</request>

Response

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<response>
<type></type>
...
</response>

XML schema

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<xs:elementname="detailedLinks"type="DetailedLinks"/>
<xs:complexTypename="DetailedLinks">
<xs:sequence>
<xs:annotation>
<xs:appinfo>
<jaxb:propertyname="links"/>
</xs:appinfo>
</xs:annotation>
<xs:elementtype="DetailedLink"name="link"maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>
<xs:elementname="link"type="Link"/>
<xs:complexTypename="Link">
<xs:attributename="href"type="xs:string"/>
<xs:attributename="rel"type="xs:string"/>
</xs:complexType>
<xs:elementname="url"type="Url"/>
<xs:complexTypename="Url">
<xs:sequence>
<xs:elementref="parameters_set"maxOccurs="unbounded"minOccurs="0">
<xs:annotation>
<xs:appinfo>
<jaxb:propertyname="ParametersSets"/>
</xs:appinfo>
</xs:annotation>
</xs:element>
</xs:sequence>
</xs:complexType>
<xs:elementname="body"type="Body"/>
<xs:complexTypename="Body">
<xs:sequence>
<xs:elementname="type"type="xs:string"minOccurs="1"maxOccurs="1"/>
<xs:elementref="parameters_set"maxOccurs="unbounded"minOccurs="0">
<xs:annotation>
<xs:appinfo>
<jaxb:propertyname="ParametersSets"/>
</xs:appinfo>
</xs:annotation>
</xs:element>
</xs:sequence>
<xs:attributename="required"type="xs:boolean">
<xs:annotation>
<xs:appinfo>
<jaxb:propertygenerateIsSetMethod="false"/>
</xs:appinfo>
</xs:annotation>
</xs:attribute>
</xs:complexType>
<xs:elementname="request"type="Request"/>
<xs:complexTypename="Request">
<xs:sequence>
<xs:elementname="http_method"type="HttpMethod"minOccurs="1"maxOccurs="1"/>
<xs:elementref="headers"minOccurs="0"maxOccurs="1"/>
<xs:elementref="url"minOccurs="0"maxOccurs="1"/>
<xs:elementref="body"minOccurs="0"maxOccurs="1"/>
</xs:sequence>
</xs:complexType>
<xs:simpleTypename="HttpMethod">
<xs:restrictionbase="xs:string">
<xs:enumerationvalue="GET"/>
<xs:enumerationvalue="POST"/>
<xs:enumerationvalue="PUT"/>
<xs:enumerationvalue="DELETE"/>
<xs:enumerationvalue="OPTIONS"/>
</xs:restriction>
</xs:simpleType>
<xs:elementname="response"type="Response"/>
<xs:complexTypename="Response">
<xs:sequence>
<xs:elementname="type"type="xs:string"minOccurs="1"maxOccurs="1"/>
</xs:sequence>
</xs:complexType>
<xs:elementname="parameter"type="Parameter"/>
<xs:complexTypename="Parameter">
<xs:complexContent>
<xs:extensionbase="BaseResource">
<xs:sequence>
<xs:elementname="value"type="xs:string"minOccurs="1"maxOccurs="1"/>
<xs:elementref="parameters_set"minOccurs="0"maxOccurs="1"/>
</xs:sequence>
<xs:attributename="required"type="xs:boolean">
<xs:annotation>
<xs:appinfo>
<jaxb:propertygenerateIsSetMethod="false"/>
</xs:appinfo>
</xs:annotation>
</xs:attribute>
<xs:attributename="type"type="xs:string"/>
<xs:attributename="context"type="xs:string"/>
</xs:extension>
</xs:complexContent>
</xs:complexType>
<xs:elementname="header"type="Header"/>
<xs:complexTypename="Header">
<xs:complexContent>
<xs:extensionbase="BaseResource">
<xs:sequence>
<xs:elementname="value"type="xs:string"minOccurs="1"maxOccurs="1"/>
</xs:sequence>
<xs:attributename="required"type="xs:boolean">
<xs:annotation>
<xs:appinfo>
<jaxb:propertygenerateIsSetMethod="false"/>
</xs:appinfo>
</xs:annotation>
</xs:attribute>
</xs:extension>
</xs:complexContent>
</xs:complexType>
<xs:elementname="headers"type="Headers"/>
<xs:complexTypename="Headers">
<xs:sequence>
<xs:elementref="header"maxOccurs="unbounded">
<xs:annotation>
<xs:appinfo>
<jaxb:propertyname="Headers"/>
</xs:appinfo>
</xs:annotation>
</xs:element>
</xs:sequence>
</xs:complexType>
<xs:elementname="parameters_set"type="ParametersSet"/>
<xs:complexTypename="ParametersSet">
<xs:sequence>
<xs:elementref="parameter"maxOccurs="unbounded"minOccurs="0">
<xs:annotation>
<xs:appinfo>
<jaxb:propertyname="Parameters"/>
</xs:appinfo>
</xs:annotation>
</xs:element>
</xs:sequence>
</xs:complexType>
<xs:elementname="schema"type="Schema"/>
<xs:complexTypename="Schema">
<xs:complexContent>
<xs:extensionbase="Link">
<xs:sequence>
<xs:elementname="name"type="xs:string"minOccurs="0"maxOccurs="1"/>
<xs:elementname="description"type="xs:string"minOccurs="0"maxOccurs="1"/>
</xs:sequence>
</xs:extension>
</xs:complexContent>
</xs:complexType>
<xs:elementname="general_metadata"type="GeneralMetadata"/>
<xs:complexTypename="GeneralMetadata">
<xs:complexContent>
<xs:extensionbase="DetailedLink">
<xs:sequence>
<xs:elementname="name"type="xs:string"minOccurs="0"maxOccurs="1"/>
<xs:elementname="description"type="xs:string"minOccurs="0"maxOccurs="1"/>
</xs:sequence>
</xs:extension>
</xs:complexContent>
</xs:complexType>
<xs:elementname="rsdl"type="RSDL"/>
<xs:complexTypename="RSDL">
<xs:sequence>
<xs:elementname="description"type="xs:string"minOccurs="0"/>
<xs:elementtype="Version"name="version"minOccurs="0"maxOccurs="1"/>
<xs:elementref="schema"minOccurs="0"maxOccurs="1"/>
<xs:elementtype="GeneralMetadata"name="general"minOccurs="0"maxOccurs="1"/>
<xs:elementtype="DetailedLinks"name="links"minOccurs="0"/>
</xs:sequence>
<xs:attributename="href"type="xs:string"/>
<xs:attributename="rel"type="xs:string"/>
</xs:complexType>

Examples

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List resources

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<linkrel="get"href="/api/clusters">
<request>
<http_method>GET</http_method>
<headers>
<headerrequired="false">
<name>Filter</name>
<value>true|false</value>
</header>
</headers>
<url>
<parameters_set>
<parametercontext="query"type="xs:string"required="false">
<name>search</name>
<value>searchquery</value>
</parameter>
<parametercontext="matrix"type="xs:boolean"required="false">
<name>case_sensitive</name>
<value>true|false</value>
</parameter>
<parametercontext="matrix"type="xs:int"required="false">
<name>max</name>
<value>maxresults</value>
</parameter>
</parameters_set>
</url>
<body/>
</request>
<response>
<type>Clusters</type>
</response>
</link>

Get resource

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<linkrel="get"href="/api/clusters/{cluster:id}">
<request>
<http_method>GET</http_method>
<headers>
<headerrequired="false">
<name>Filter</name>
<value>true|false</value>
</header>
</headers>
<body/>
</request>
<response>
<type>Cluster</type>
</response>
</link>

Update resource

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<linkrel="update"href="/api/clusters/{cluster:id}">
<request>
<http_method>PUT</http_method>
<headers>
<headerrequired="true">
<name>Content-Type</name>
<value>application/xml|json</value>
</header>
<headerrequired="false">
<name>Correlation-Id</name>
<value>anystring</value>
</header>
</headers>
<body>
<type>Cluster</type>
<parameters_set>
<parametertype="xs:string"required="false">
<name>cluster.name</name>
</parameter>
<parametertype="xs:string"required="false">
<name>cluster.description</name>
</parameter>
<parametertype="xs:string"required="false">
<name>cluster.cpu.id</name>
</parameter>
<parametertype="xs:int"required="false">
<name>cluster.version.major</name>
</parameter>
<parametertype="xs:int"required="false">
<name>cluster.version.minor</name>
</parameter>
<parametertype="xs:double"required="false">
<name>cluster.memory_policy.overcommit.percent</name>
</parameter>
<parametertype="xs:boolean"required="false">
<name>cluster.memory_policy.transparent_hugepages.enabled
</name>
</parameter>
<parametertype="xs:string"required="false">
<name>cluster.scheduling_policy.policy</name>
</parameter>
<parametertype="xs:int"required="false">
<name>cluster.scheduling_policy.thresholds.low</name>
</parameter>
<parametertype="xs:int"required="false">
<name>cluster.scheduling_policy.thresholds.high</name>
</parameter>
<parametertype="xs:int"required="false">
<name>cluster.scheduling_policy.thresholds.duration</name>
</parameter>
<parametertype="xs:string"required="false">
<name>cluster.error_handling.on_error</name>
</parameter>
<parametertype="xs:boolean"required="false">
<name>cluster.virt_service</name>
</parameter>
<parametertype="xs:boolean"required="false">
<name>cluster.gluster_service</name>
</parameter>
<parametertype="xs:boolean"required="false">
<name>cluster.threads_as_cores</name>
</parameter>
<parametertype="xs:boolean"required="false">
<name>cluster.tunnel_migration</name>
</parameter>
</parameters_set>
</body>
</request>
<response>
<type>Cluster</type>
</response>
</link>

Create resource

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<linkrel="add"href="/api/clusters">
<request>
<http_method>POST</http_method>
<headers>
<headerrequired="true">
<name>Content-Type</name>
<value>application/xml|json</value>
</header>
<headerrequired="false">
<name>Expect</name>
<value>201-created</value>
</header>
<headerrequired="false">
<name>Correlation-Id</name>
<value>anystring</value>
</header>
</headers>
<body>
<type>Cluster</type>
<parameters_set>
<parametertype="xs:string"required="true">
<name>cluster.data_center.id|name</name>
</parameter>
<parametertype="xs:string"required="true">
<name>cluster.name</name>
</parameter>
<parametertype="xs:int"required="true">
<name>cluster.version.major</name>
</parameter>
<parametertype="xs:int"required="true">
<name>cluster.version.minor</name>
</parameter>
<parametertype="xs:string"required="true">
<name>cluster.cpu.id</name>
</parameter>
<parametertype="xs:string"required="false">
<name>cluster.description</name>
</parameter>
<parametertype="xs:double"required="false">
<name>cluster.memory_policy.overcommit.percent</name>
</parameter>
<parametertype="xs:boolean"required="false">
<name>cluster.memory_policy.transparent_hugepages.enabled</name>
</parameter>
<parametertype="xs:string"required="false">
<name>cluster.scheduling_policy.policy</name>
</parameter>
<parametertype="xs:int"required="false">
<name>cluster.scheduling_policy.thresholds.low</name>
</parameter>
<parametertype="xs:int"required="false">
<name>cluster.scheduling_policy.thresholds.high</name>
</parameter>
<parametertype="xs:int"required="false">
<name>cluster.scheduling_policy.thresholds.duration</name>
</parameter>
<parametertype="xs:string"required="false">
<name>cluster.error_handling.on_error</name>
</parameter>
<parametertype="xs:boolean"required="false">
<name>cluster.virt_service</name>
</parameter>
<parametertype="xs:boolean"required="false">
<name>cluster.gluster_service</name>
</parameter>
<parametertype="xs:boolean"required="false">
<name>cluster.threads_as_cores</name>
</parameter>
<parametertype="xs:boolean"required="false">
<name>cluster.tunnel_migration</name>
</parameter>
</parameters_set>
</body>
</request>
<response>
<type>Cluster</type>
</response>
</link>

Delete resource

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<linkrel="delete"href="/api/clusters/{cluster:id}">
<request>
<http_method>DELETE</http_method>
<headers>
<headerrequired="false">
<name>Correlation-Id</name>
<value>anystring</value>
</header>
</headers>
<url>
<parameters_set>
<parametercontext="matrix"type="xs:boolean"required="false">
<name>async</name>
<value>true|false</value>
</parameter>
</parameters_set>
</url>
<body/>
</request>
</link>

Code generation

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RSDL URI descriptor

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<linkrel="add"href="/api/clusters">
<request>
<http_method>POST</http_method>
<headers>
<headerrequired="true">
<name>Content-Type</name>
<value>application/xml|json</value>
</header>
<headerrequired="false">
<name>Expect</name>
<value>201-created</value>
</header>
<headerrequired="false">
<name>Correlation-Id</name>
<value>anystring</value>
</header>
</headers>
<body>
<type>Cluster</type>
<parameters_set>
<parametertype="xs:string"required="true">
<name>cluster.data_center.id|name</name>
</parameter>
<parametertype="xs:string"required="true">
<name>cluster.name</name>
</parameter>
<parametertype="xs:int"required="true">
<name>cluster.version.major</name>
</parameter>
<parametertype="xs:int"required="true">
<name>cluster.version.minor</name>
</parameter>
<parametertype="xs:string"required="true">
<name>cluster.cpu.id</name>
</parameter>
<parametertype="xs:string"required="false">
<name>cluster.description</name>
</parameter>
<parametertype="xs:double"required="false">
<name>cluster.memory_policy.overcommit.percent</name>
</parameter>
<parametertype="xs:boolean"required="false">
<name>cluster.memory_policy.transparent_hugepages.enabled</name>
</parameter>
<parametertype="xs:string"required="false">
<name>cluster.scheduling_policy.policy</name>
</parameter>
<parametertype="xs:int"required="false">
<name>cluster.scheduling_policy.thresholds.low</name>
</parameter>
<parametertype="xs:int"required="false">
<name>cluster.scheduling_policy.thresholds.high</name>
</parameter>
<parametertype="xs:int"required="false">
<name>cluster.scheduling_policy.thresholds.duration</name>
</parameter>
<parametertype="xs:string"required="false">
<name>cluster.error_handling.on_error</name>
</parameter>
<parametertype="xs:boolean"required="false">
<name>cluster.virt_service</name>
</parameter>
<parametertype="xs:boolean"required="false">
<name>cluster.gluster_service</name>
</parameter>
<parametertype="xs:boolean"required="false">
<name>cluster.threads_as_cores</name>
</parameter>
<parametertype="xs:boolean"required="false">
<name>cluster.tunnel_migration</name>
</parameter>
</parameters_set>
</body>
</request>
<response>
<type>Cluster</type>
</response>
</link>

Generated code signature(s)

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/**
 * Adds Cluster object.
 * @param cluster {@link org.ovirt.engine.sdk.entities.Cluster}
 * cluster.data_center.id|name
 * cluster.name
 * cluster.version.major
 * cluster.version.minor
 * cluster.cpu.id
 * [cluster.description]
 * [cluster.memory_policy.overcommit.percent]
 * [cluster.memory_policy.transparent_hugepages.enabled]
 * [cluster.scheduling_policy.policy]
 * [cluster.scheduling_policy.thresholds.low]
 * [cluster.scheduling_policy.thresholds.high]
 * [cluster.scheduling_policy.thresholds.duration]
 * [cluster.error_handling.on_error]
 * [cluster.virt_service]
 * [cluster.gluster_service]
 * [cluster.threads_as_cores]
 * [cluster.tunnel_migration]
 * @return
 * {@link Cluster }
 * @throws ClientProtocolException
 * Signals that HTTP/S protocol error has occurred.
 * @throws ServerException
 * Signals that an oVirt api error has occurred.
 * @throws IOException
 * Signals that an I/O exception of some sort has occurred.
 */
publicClusteradd(org.ovirt.engine.sdk.entities.Clustercluster)throws
ClientProtocolException,ServerException,IOException{
....
}
/**
 * Adds Cluster object.
 * @param cluster {@link org.ovirt.engine.sdk.entities.Cluster}
 * cluster.data_center.id|name
 * cluster.name
 * cluster.version.major
 * cluster.version.minor
 * cluster.cpu.id
 * [cluster.description]
 * [cluster.memory_policy.overcommit.percent]
 * [cluster.memory_policy.transparent_hugepages.enabled]
 * [cluster.scheduling_policy.policy]
 * [cluster.scheduling_policy.thresholds.low]
 * [cluster.scheduling_policy.thresholds.high]
 * [cluster.scheduling_policy.thresholds.duration]
 * [cluster.error_handling.on_error]
 * [cluster.virt_service]
 * [cluster.gluster_service]
 * [cluster.threads_as_cores]
 * [cluster.tunnel_migration]
 * @param expect
 * [201-created]
 * @param correlationId
 * [any string]
 * @return
 * {@link Cluster }
 * @throws ClientProtocolException
 * Signals that HTTP/S protocol error has occurred.
 * @throws ServerException
 * Signals that an oVirt api error has occurred.
 * @throws IOException
 * Signals that an I/O exception of some sort has occurred.
 */
publicClusteradd(org.ovirt.engine.sdk.entities.Clustercluster,Stringexpect,StringcorrelationId)throws
ClientProtocolException,ServerException,IOException{
....
}

References

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