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XML Protocol Comparisons
Eric Prud'hommeaux,
but please post comments to
xml-dist-app@w3.org
@(#) $Id: 29-XML-protocol-matrix.html,v 1.41 2003/06/13 15:37:12 eric Exp $
XML Protocol Comparisons
The purpose of this document is to compare and contrast a variety of XML
protocols. It will probably take a while to flesh out the form and content.
Viewers are invited to comment and contribute. The forum for discussing this
page and the data within is xml-dist-app@w3.org. The list and archives are
open, you may join xml-dist-app by sending mailto xml-dist-app-request@w3.org with
the Subject: subscribe.
Since this document was created in March 2000, W3C chartered the XML Protocol Working Group whose task is to produce a simple XML-based messaging and remote procedure call protocol.
| XML syntax | ||||||||
|---|---|---|---|---|---|---|---|---|
| Protocol | Organization | Architects | Status | ns | schema | DTD | Facets | Example |
| generic XML protocols | provide a mechanism to represent arbitrary data. | |||||||
| XML-RPC | Userland | Dave
Winer (userland), Bob Atkinson (microsoft), Mohsen Al-Ghosein (microsoft), Don Box (developmentor) |
deployed | 0 | 0 | 1? | [in a POST parameter] <methodCall>
<methodName>examples.getStateName</methodName>
<params>
<param>
<value><i4>41</i4></value>
</param>
</params>
</methodCall>
|
|
| SOAP (mailing list) |
Ariba, Inc. Commerce One, Inc. Compaq Computer Corporation DevelopMentor, Inc. Hewlett Packard Company International Business Machines Corporation IONA Technologies Lotus Development Corporation Microsoft Corporation SAP AG UserLand Software Inc. |
Don Box, DevelopMentor David Ehnebuske, IBM Gopal Kakivaya, Microsoft Andrew Layman, Microsoft Noah Mendelsohn, Lotus Development Corp. Henrik Frystyk Nielsen, Microsoft Satish Thatte, Microsoft Dave Winer, UserLand Software, Inc. |
coded W3C NOTE |
2 | 2 | 0 | <SOAP-ENV:Envelope
xmlns:SOAP-ENV="https://schemas.xmlsoap.org/soap/envelope/"
SOAP-ENV:encodingStyle="https://schemas.xmlsoap.org/soap/encoding/"/>
<SOAP-ENV:Body>
<e:Book>
<title>My Life and Work</title>
<firstauthor href="#Person-1"/>
<secondauthor href="#Person-2"/>
</e:Book>
<e:Person id="Person-1">
<name>Henry Ford</name>
<address xsi:type="m:Electronic-address">
<email>mailto:henryford@hotmail.com</email>
<web>https://www.henryford.com</web>
</address>
</e:Person>
<e:Person id="Person-2">
<name>Samuel Crowther</name>
<address xsi:type="n:Street-address">
<street>Martin Luther King Rd</street>
<city>Raleigh</city>
<state>North Carolina</state>
</address>
</e:Person>
</SOAP-ENV:Body>
</SOAP-ENV:Envelope>
|
|
| WDDX | Allaire | Simeon Simeonov (Allaire), Nate Weiss (independent/JavaScript), Spike Washburn (Allaire/Java), Rasmus Lerdorf (PHP3), Scott Guelich (Scripted.com/Perl) |
deployed | 0 | 0 | 1 | <?xml version='1.0'?>
<!DOCTYPE wddxPacket SYSTEM 'wddx_0090.dtd'>
<wddxPacket version='0.9'>
<header/>
<data>
<struct>
<var name='s'><string>a string</string></var>
<var name='a'><array length='2'>
<number>10</number>
<string>second element</string></array></var>
<var name='obj'><struct>
<var name='s'><string>a string</string></var>
<var name='n'><number>-12.456</number></var>
</struct></var>
</struct>
</data>
</wddxPacket>
|
|
| XMI | Unisys Corporation Fujitsu IBM DSTC Recerca Informatica Oracle Daimler-Benz Platinum Technology |
deployed (Unisys) (ArgoUML exports XMI) |
1 | 0 | 1 | [UML model in an XMI document] <XMI xmi.version="1.1" xmlns:UML="org.omg/standards/UML">
<XMI.header>
<XMI.metamodel name="UML" version="1.3" href="UML.xml"/>
<XMI.model name="example" version="1" href="example.xml"/>
</XMI.header>
<XMI.content>
<UML:Class name="C1">
<UML:Classifier.feature>
<UML:Attribute name="a1" visibility="private"/>
</UML:Classifier.feature>
</UML:Class>
</XMI.content>
</XMI>
|
||
| Jabber | Jabber.org Open Source Project | Jeremie Miller | deployed | 1 | 0 | 1 | not reviewed yet | <stream:stream xmlns:stream="https://etherx.jabber.org/streams"
xmlns="jabber:client" to="jabber.org">
<message to="jeremie@jabber.org">
<subject>Test</subject>
<body>This is a test message.</body>
</message>
<presence>
<status>Working on Project XYZ</status>
<show>away</show>
</presence>
</stream:stream>
|
| ebXML | UN/CEFACT oasis |
from a message from Dick Brooks SOAPAction: ebXML
Content-type: multipart/related; boundary="BoundarY"; type="text/xml";
start=" <ebxhmheader111@imacompany.com>"
--BoundarY
Content-ID: <ebxhmheader111@imacompany.com>
Content-Type: text/xml; charset="UTF-8"
<?xml version="1.0" encoding="UTF-8"?>
<SOAP-ENV:Envelope
xmlns:SOAP-ENV='https://schemas.xmlsoap.org/soap/envelope/'
xmlns:eb='https://www.ebxml.org/namespaces/messageHeader'>
<SOAP-ENV:Header>
<eb:MessageHeader mustUnderstand="1" version="1.0">
<From>
<PartyId>urn:duns:123456789</PartyId>
</From>
<To>
<PartyId>urn:duns:912345678</PartyId>
</To>
<CPAId>20001209-133003-28572</CPAId>
<ConversationId>20001209-133003-28572</ConversationId>
<Service type="proprietary">OrderProcessing</Service>
<Action>NewXMLOrder</Action>
<MessageData>
<MessageId>mid:20001209-133003-28572@imacompany.com</MessageId>
<TimeStamp>20010215T111212.000Z</TimeStamp>
<TimeToLive>20010215T112233.000Z</TimeToLive>
</MessageData>
<QualityofServiceInfo deliverySemantics="OnceAndOnlyOnce"
messageOrderSemantics="NotGuaranteed"
deliveryReceiptRequested="None"/>
<Description xml:lang="en">A Purchase Order is
attached</Description>
</MessageHeader>
</SOAP-ENV:Header>
<SOAP-ENV:Body>
<eb:Manifest id="abc123" version="1.0">
<Reference xlink:href="urn:cid:ebxmlpayload111@imacompany.com"
xlink:role="XLinkRole"
xlink:type="simple"
xlink:label="XLinkLabel">
<Description xml:lang="en-us">Purchase Order 1</Description>
</Reference>
</Manifest>
</SOAP-ENV:Body>
</SOAP-ENV:Envelope>
--BoundarY
Content-ID: <ebxmlpayload111@imacompany.com>
Content-Type: text/xml
<purchase_order>
<po_number>1</po_number>
<part_number>123</part_number>
<price currency="USD">500.00</price>
</purchase_order>
--BoundarY--
|
||||||
| BizTalk June 2000 spec (graph discussion) |
Microsoft | Satish Thatte | ? | 2 | 2 | 0 | SOAPfacets plus: | <SOAP-ENV:Envelope
xmlns:SOAP-ENV="https://schemas.xmlsoap.org/soap/envelope/"
xmlns:xsi="https://www.w3.org/1999/XMLSchema-instance">
<SOAP-ENV:Header>
<dlv:delivery SOAP-ENV:mustUnderstand="1"
xmlns:dlv="https://schemas.biztalk.org/btf-2-0/delivery"
xmlns:agr="https://www.trading-agreements.org/types/">
<dlv:to>
<dlv:address xsi:type="agr:department">Book Order
Department</dlv:address>
</dlv:to>
<dlv:from>
<dlv:address xsi:type="agr:organization">Booklovers
Anonymous</dlv:address>
</dlv:from>
</dlv:delivery>
<prop:properties SOAP-ENV:mustUnderstand="1"
xmlns:prop="https://schemas.biztalk.org/btf-2-0/properties">
<prop:identity>uuid:74b9f5d0-33fb-4a81-b02b-5b760641c1d6</prop:identity>
<prop:sentAt>2000-05-14T03:00:00+08:00</prop:sentAt>
<prop:expiresAt>2000-05-15T04:00:00+08:00</prop:expiresAt>
<prop:topic>https://electrocommerce.org/purchase_order/</prop:topic>
</prop:properties>
</SOAP-ENV:Header>
<SOAP-ENV:Body>
<po:PurchaseOrder
xmlns:po="https://electrocommerce.org/purchase_order/">
<po:Title>Essential BizTalk</po:Title>
</po:PurchaseOrder>
</SOAP-ENV:Body>
</SOAP-ENV:Envelope>
|
| Wf-XML mailing list |
Workflow Management Coalition | WfMC Working Group 4 | beta spec V 1.0 due mid-April |
0 due?in?1.0 |
0 due?in?1.0 |
1 |
|
<WfMessage Version= 1.0>
<WfMessageHeader>
<Request><ResponseRequired>Yes</ResponseRequired></Request>
<Key>https://www.XYZcompany.com/wfprocess</Key>
<Operation>CreateProcessInstance</Operation>
</WfMessageHeader>
<WfMessageBody>
<CreateProcessInstance.Request>
<Key>https://www.XYZcompany.com/wfprocess</Key>
<ObserverKey>https://www.mycompany.com/mywork</ObserverKey>
<ContextData>
<Vehicle>
<VehicleType>Car</VehicleType>
<Specification>
<Manufacturer>Mercedes</Manufacturer>
<Model>450SL</Model>
</Specification>
</Vehicle>
<Furniture>chair</Furniture>
</ContextData>
<StartImmediately>Yes</StartImmediately>
</CreateProcessInstance.Request>
</WfMessageBody>
</WfMessage>
|
| LOTP | not reviewed yet | |||||||
| web service-related XML protocols | protocols with a fixed grammar targeting a particular application domain. | |||||||
| WSDL | Ariba International Business Machines Corporation Microsoft | Erik Christensen (Microsoft) Francisco Curbera (IBM) Greg Meredith (Microsoft) Sanjiva Weerawarana (IBM) | not reviewed yet | from Web Services Description Language (WSDL) 1.0 You find find the colorized WSDL examples helpful. <?xml version="1.0"?>
<definitions name="StockQuote"
targetNamespace="https://example.com/stockquote.wsdl"
xmlns:tns="https://example.com/stockquote.wsdl"
xmlns:xsd1="https://example.com/stockquote.xsd"
xmlns:soap="https://schemas.xmlsoap.org/wsdl/soap/"
xmlns="https://schemas.xmlsoap.org/wsdl/">
<types>
<schema targetNamespace="https://example.com/stockquote.xsd"
xmlns="https://www.w3.org/1999/XMLSchema">
<element name="TradePriceRequest">
<complexType>
<all>
<element name="tickerSymbol" type="string"/>
</all>
</complexType>
</element>
<element name="TradePrice">
<complexType>
<all>
<element name="price" type="float"/>
</all>
</complexType>
</element>
</schema>
</types>
<message name="GetLastTradePriceInput">
<part name="body" element="xsd1:TradePrice"/>
</message>
<message name="GetLastTradePriceOutput">
<part name="body" element="xsd1:TradePriceResult"/>
</message>
<portType name="StockQuotePortType">
<operation name="GetLastTradePrice">
<input message="tns:GetLastTradePriceInput"/>
<output message="tns:GetLastTradePriceOutput"/>
</operation>
</portType>
<binding name="StockQuoteSoapBinding" type="tns:StockQuotePortType">
<soap:binding style="document" transport="https://schemas.xmlsoap.org/soap/http"/>
<operation name="GetLastTradePrice">
<soap:operation soapAction="https://example.com/GetLastTradePrice"/>
<input>
<soap:body use="literal" namespace="https://example.com/stockquote.xsd"
encodingStyle="https://schemas.xmlsoap.org/soap/encoding/"/>
</input>
<output>
<soap:body use="literal" namespace="https://example.com/stockquote.xsd"
encodingStyle="https://schemas.xmlsoap.org/soap/encoding/"/>
</output>
</operation>
</binding>
<service name="StockQuoteService">
<documentation>My first service</documentation>
<port name="StockQuotePort" binding="tns:StockQuoteBinding">
<soap:address location="https://example.com/stockquote"/>
</port>
</service>
</definitions> | ||||
| WIDL | webMethods | Phillip Merrick (webMethods) Charles Allen (webMethods) | from 4. WIDL Examples <WIDL NAME="genericShipping" TEMPLATE="Shipping"
BASEURL="https://www.shipping.com" VERSION="2.0">
<SERVICE NAME="TrackPackage" METHOD="Get"
URL="/cgi-bin/track_package"
INPUT="TrackInput" OUTPUT="TrackOutput" />
<BINDING NAME="TrackInput" TYPE="INPUT">
<VARIABLE NAME="TrackingNum" TYPE="String" FORMNAME="trk_num" />
<VARIABLE NAME="DestCountry" TYPE="String" FORMNAME="dest_cntry" />
<VARIABLE NAME="ShipDate" TYPE="String" FORMNAME="ship_date" />
</BINDING>
<BINDING NAME="TrackOutput" TYPE="OUTPUT">
<CONDITION TYPE="Failure" REFERENCE="doc.title[0].text"
MATCH="Warning Form" REASONREF="doc.p[0].text" />
<CONDITION TYPE="Success" REFERENCE="doc.title[0].text"
MATCH="Foobar Airbill:*" REASONREF="doc.p[1].value" />
<VARIABLE NAME="disposition" TYPE="String" REFERENCE="doc.h[3].value" />
<VARIABLE NAME="deliveredOn" TYPE="String" REFERENCE="doc.h[5].value" />
<VARIABLE NAME="deliveredTo" TYPE="String" REFERENCE="doc.h[7].value" />
</BINDING>
</WIDL> | |||||
| SCL | org1 org2 | name1 (co) name2 (co) | not reviewed yet | [comment] | ||||
| UDDI | ARIBA | not reviewed yet | from UDDI Data Structure Reference <element name="businessEntity">
<type content="elementOnly">
<group order="seq">
<element ref="discoveryURLs" minOccurs="0" maxOccurs="1"/>
<element ref="name"/>
<element ref="description" minOccurs="0" maxOccurs="*"/>
<element ref="contacts" minOccurs="0" maxOccurs="1"/>
<element ref="businessServices" minOccurs="0" maxOccurs="1"/>
<element ref="identifierBag" minOccurs="0" maxOccurs="1"/>
<element ref="categoryBag" minOccurs="0" maxOccurs="1"/>
</group>
<attribute name="businessKey" minOccurs="1" type="string"/>
<attribute name="operator" type="string"/>
<attribute name="authorizedName" type="string"/>
</type>
</element> | |||||
| DISCO | Microsoft | not reviewed yet | from Draft: Discovery of Web Services (DISCO) <disco:discovery> <disco:discoveryRef ref='folder/discovery'/> <-- elements from other namespaces --> </disco:discovery> <disco:discovery> <scl:contractRef ref='my1.sdl'> <scl:contractRef ref='my2.sdl' docRef='my.htm'> </disco:discovery> <disco:discovery> <schema:schemaRef ref='my1.xsd' targetNamespace='https://my.org/my1.xsd'/> <schema:schemaRef ref='my2.xsd'/> </disco:discovery> | |||||
| NASSL | IBM | Francisco Curbera Sanjiva Weerawarana Matthew J. Duftler | not reviewed yet | from NASSL paper <?xml version="1.0"?>
<nsl:serviceDef name="StockQuoteService"
version="1.0"
xmlns:nsl="https://www.ibm.com/namespaces/NASSL"
xmlns:sqs="https://www.getquote.com/ns/StockQuote"
xmlns:xsd="https://www.w3.org/1999/XMLSchema">
<nsl:types>
<nsl:typeDefs typeModel="https://www.w3.org/1999/XMLSchema">
<xsd:schema targetNamespace="https://www.getquote.com/ns/StockQuote">
<xsd:complexType name="stockquote">
<xsd:element name="date" type="xsd:date"/>
<xsd:element name="price" type="xsd:float"/>
<xsd:element name="change" type="xsd:float"/>
<xsd:element name="volume" type="xsd:int"/>
</xsd:complexType>
</xsd:schema>
</nsl:typeDefs>
</nsl:types>
<nsl:interfaces>
<nsl:interfaceDef name="GetQuote">
<nsl:operationDef name="getQuote">
<nsl:type name="sqs:stockquote"/>
<nsl:parameters>
<nsl:parameterDef name="symbol" direction="IN">
<nsl:type name="xsd:string"/>
</nsl:parameterDef>
</nsl:parameters>
</nsl:operationDef>
</nsl:interfaceDef>
</nsl:interfaces>
<nsl:implementations>
<nsl:implementationDef name="HTTP-POST-GetQuotes">
<nsl:implements interface="GetQuote"/>
<nsl:access protocol="HTTP-POST"/>
</nsl:implementationDef>
<nsl:implementationDef name="RPC-SOAP-HTTP-GetQuotes">
<nsl:implements interface="GetQuote"/>
<nsl:access protocol="RPC-SOAP-HTTP"/>
<nsl:encoding styles="https://schemas.xmlsoap.org/soap/encoding/
https://www.ibm.com/namespaces/xmi"/>
<nsl:protocolExtensions>
<operationsURI value="urn:StockQuoteService"/>
<methodNamespace value=""/>
<action value="urn:get-quote-rpc-soap-http"/>
</nsl:protocolExtensions>
</nsl:implementationDef>
</nsl:implementations>
<nsl:providers>
<nsl:providerDef>
<nsl:provides implementation="HTTP-POST-GetQuotes"/>
<nsl:endPoint url="https://www.getquote.com/cgi-bin/getquote.pl"/>
</nsl:providerDef>
<nsl:providerDef>
<nsl:provides implementation="RPC-SOAP-HTTP-GetQuotes"/>
<nsl:endPoint url="https://www.getquote.com/ibm-soap-1.2/rpcrouter.jsp"/>
</nsl:providerDef>
</nsl:providers>
</nsl:serviceDef> | ||||
| domain-specific XML protocols | protocols with a fixed grammar targeting a particular application domain. | |||||||
| ICE | GCA | Neil Webber, Vignette
Corporation Conleth O'Connell, Vignette Corporation Bruce Hunt, Adobe Systems, Inc. Rick Levine, Sun Microsystems, Inc. Laird Popkin, Sothebys.com |
deployed | 0 | 0 | 1 | <?xml version="1.0"?>
<!DOCTYPE ice-payload
SYSTEM "https://www.ice-ag.org/ICE.dtd">
<ice-payload
payload-id="1998-07-05T02:02:23@xyz.com"
timestamp="02:02:23,449"
ice.version="1.0">
<ice-header>
<ice-sender
sender-id="4af37b30-2c35-11d2-be4a-204c4f4f5020"
name="XYZ Corporation"
role="subscriber"/>
<ice-user-agent>Acme Ray Gun ICE System, V0.9beta</ice-user-agent>
</ice-header>
<ice-request
request-id="1998-07-05T02:02:23@xyz.com-1">
<ice-nop/>
</ice-request>
</ice-payload>
|
|
| IOTP | Commerce One | David Burdett | ? | 0 | 0 | 1 | <BrandList ID='M1.2'
XML:Lang='us-en'
ShortDesc='Purchase book including s&h'
PayDirection='Debit' >
<Brand ID ='M1.30'
BrandId='MasterCard'
BrandName='MasterCard Credit'
BrandLogoNetLocn='ftp://otplogos.mastercard.com/mastercardcredit'
ProtocolAmountRefs='M1.33'>
</Brand>
<Brand ID ='M.31'
BrandId='Visa'
BrandName='Visa Credit'
BrandLogoNetLocn='ftp://otplogos.visa.com/visacredit'
ProtocolAmountRefs='M1.33'>
</Brand>
<Brand ID ='M1.32'
BrandId='AmericanExpress'
BrandName='American Express'
BrandLogoNetLocn='ftp://otplogos.amex.com'
ProtocolAmountRefs ='M1.33' >
</Brand >
<ProtocolAmount ID ='M1.33'
PayProtocolRef='M1.35'
CurrencyAmountRefs='M1.34'>
</ProtocolAmount>
<CurrencyAmount ID ='M1.34'
Amount='10.95'
CurrCode='USD'/>
<PayProtocol ID ='M1.35'
ProtocolId='SCCD1.0'
ProtocolName='Secure Channel Credit/Debit'
PayReqNetLocn='https://www.example.com/etill/sccd1' >
</PayProtocol>
</BrandList>
|
|
| eCo | not reviewed yet | |||||||
| XMOP | not reviewed yet | |||||||
| XIOP (spec) |
Financial Toolsmiths AB | Anders W. Tell (Financial Toolsmiths AB) | Alpha 2Q 2000 | "https://xiop.org/" | 0 due in 1.0 | 0 due in 1.0 | reviewed by Anders
Tell no peer review yet... |
from https://xiop.sourceforge.net/doc/xiop_examples_1_2.html <typecode>
<tk_struct repoid="IDL:/TheStruct:1.0"
name="TheStruct"
members="3">
<tk_struct_member name="first">
<typecode> <!-- first members typecode -->
<tk_octet/>
</typecode>
</tk_struct_member>
<tk_struct_member name="next">
<typecode> <tk_long/> </typecode>
</tk_struct_member>
<tk_struct_member name="last">
<typecode> <tk_string max-length="100"/> </typecode>
</tk_struct_member>
</tk_struct>
</typecode>
|
| P3P | W3C | Lorrie Cranor
(AT&T), Marc Langheinrich (ETH Zurich), Massimo Marchiori (W3C/MIT), Martin Presler-Marshall (IBM), Joseph Reagle (W3C/MIT) |
deployment status | namespace | schema | dtd | not reviewed yet | from example 3.1 <POLICY xmlns="https://www.w3.org/2000/P3Pv1"
discuri="https://www.catalog.example.com/PrivacyPracticeBrowsing.html">
<ENTITY>
<DATA-GROUP>
<DATA ref="#business.name">CatalogExample</DATA>
<DATA ref="#business.contact-info.postal.street.line1">4000 Lincoln Ave.</DATA>
<DATA ref="#business.contact-info.telecom.telephonenum.number">3926753</DATA>
</DATA-GROUP>
</ENTITY>
<DISPUTES-GROUP>
<DISPUTES resolution-type="independent"
service="https://www.PrivacySeal.example.org"
short-description="PrivacySeal.example.org">
<REMEDIES><correct/></REMEDIES>
<IMG src="https://www.PrivacySeal.example.org/Logo.gif"/>
</DISPUTES>
</DISPUTES-GROUP>
<ACCESS><nonident/></ACCESS>
<STATEMENT>
<PURPOSE><admin/><develop/></PURPOSE>
<RECIPIENT><ours/></RECIPIENT>
<RETENTION><stated-purpose/></RETENTION>
<DATA-GROUP>
<DATA ref="#dynamic.clickstream.server"/>
<DATA ref="#dynamic.http.useragent"/>
</DATA-GROUP>
</STATEMENT>
</POLICY>
|
| CCPP | W3C | Franklin
Reynolds (Nokia Research Center) Johan Hjelm (W3C/Ericsson) Spencer Dawkins (Nortel) Sandeep Singhal (IBM) |
testing | 1 | RDF | 0 | not reviewed yet | [from Inline example] <?xml version="1.0"?>
<rdf:RDF
xmlns:rdf="https://www.w3.org/1999/02/22-rdf-syntax-ns#"
xmlns:prf="https://www.w3.org/TR/WD-profile-vocabulary#">
<rdf:Description about="HardwarePlatform">
<prf:Defaults Vendor="Nokia" Model="2160" Type="PDA" ScreenSize="800x600x24"
CPU="PPC" Keyboard="Yes" Memory="16mB" Bluetooth="YES" Speaker="Yes" />
<prf:Modifications Memory="32mB" />
</rdf:Description>
<rdf:Description about="SoftwarePlatform">
<prf:Defaults OS="EPOC1.0" HTMLVersion="4.0" JavaScriptVersion="4.0"
WAPVersion="1.0" WMLScript="1.0" />
<prf:Modifications Sound="Off" Images="Off" />
</rdf:Description>
<rdf:Description about="EpocEmail1.0">
<prf:Defaults HTMLVersion="4.0" />
</rdf:Description>
<rdf:Description about="EpocCalendar1.0">
<prf:Defaults HTMLVersion="4.0" />
</rdf:Description>
<rdf:Description about="UserPreferences">
<prf:Defaults Language="English"/>
</rdf:Description>
</rdf:RDF>
|
| E-Speak | hp | ??? | deployed? | namespace | schema | dtd | not reviewed yet | [comment] |
| transport/transfer protocols | Transport and Transfer protocols designed to carry XML protocol payloads. | |||||||
| BXXP app design protocol Note - these are broken links. Try incrementing the numbers at the end of the URL to see where they are now. older HTML version of protocol draft |
- no research on this topic yet - | |||||||
| Transaction Internet
Protocol (part deux) |
Microsoft Tandem |
J. Lyon (Microsoft) K. Evans (Tandem) J. Klein (Tandem) |
||||||
| HTTP-NG (architecture) |
A layered distributed object system with underlying protocol support. | |||||||
| WorldOS | WorldOS Corp. | Lucas Gonze | deployed | 0 | 0 | 0 | <?xml version="1.0" encoding="UTF-8"?>
<msg>
<protocol>
<id>WorldOS</id>
<version>0.1</version>
<definition>https://www.worldos.org/WorldOS.xml</definition>
<checksum>-1</checksum>
<function>debug</function>
</protocol>
<funcdata />
</msg>
|
|
| non-XML protocols | non-XML protocols that may have some interesting lessons for us. | |||||||
| XDR | XDR is Sun's RPC data format. | |||||||
| RACE | Global Financial Networks Limited | Charles Kilkenny (Global Financial Networks Limited) | draft | N/A | N/A | N/A | not independently reviewed yet | |
Facets
Below is the list of facets I have defined for characterizing these protocols.
- serialization
- format for storing primitive data types (int, char, string),
structures, and matrices
grammar types:- custom
- The XML schema is specific to the application, doesn't (intentionally) share characteristics with other applications. These almost always reflect the application data structure closely.
- automatic
- Generated XML that uses element names derived from application data structures through some type of mapping or rules.
- fixed
- Generated XML that uses fixed element names to serialize application data structures.
- implicit (contextual)
- does not carry detailed data types in the serialization or an external schema
- explicit
- data types with elements or in an external schema
- extensibility
- a mechanism allowing features and functionality to be added beyond what the architects can predict. Some protocols mention extensibility as a requirement without defining the mechanism. Generally, protocols that use namespaces and specify what to do with unknown namespaces get extensibility for free.
- skinnyness
- reduces to a minimal line protocol for communication between non-naive agents. This implies removing all schema information. Pairing this with interface discovery requires sufficient parameter identification that a naive agent may also participate with additional schema information.
- protocol
- definition of requests and responses. This implies state transitions and defined error messages when state transitions fail.
- interface discovery
- machine-readable markup allowing a naive application to access the typed data. Supporting schemas in turn supports interface discovery.
- transactions (ACIDity)
- atomicity and state clarity that allows an action to be partially completed and then undone. (ACID == atomicity, consistency, isolation and durability)
- remote procedure
- The protocol explicitly supports sending requests to a remote system to execute a designated function, method, or procedure defined by an application using the protocol rather than functions defined in or by the protocol itself.
- business process
- modeling of business workflow conventions
- security
- rules on how data should be digitally signed to prove authenticity and authorization of requested actions
- routing
- message forwarding from agent to agent depending on attributes of the message
- packaging
- Construction of multi-document messages including non-XML documents as attachments. Usually includes mechanisms for constructing URI references to packaged documents.
Eric Prud'hommeaux,
but please post comments to
xml-dist-app@w3.org
@(#) $Id: 29-XML-protocol-matrix.html,v 1.41 2003/06/13 15:37:12 eric Exp $