logging in or signing up 2 Microsoft 050210 SOA seminarium Sigismondo Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINTLite Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: (To copy code, click on the text box) Embed: URL: Thumbnail: WordPress Embed Customize Embed The presentation is successfully added In Your Favorites. Views: 379 Category: Education License: All Rights Reserved Like it (0) Dislike it (0) Added: February 20, 2008 This Presentation is Public Favorites: 0 Presentation Description No description available. Comments Posting comment... By: kallolchowdhury (15 month(s) ago) How interesting and amazing this post is! It is useful and helpful for me that I like it very much,and I am looking forward to hearing from your next. I have seen such kind of blog in another site. i.e. Architect Pavilion. You can take a tour in architect pavilion. I think it will help you to express your views. It is very usefull site for sw Architect , developers etc. The link is : http://www.architectpavilion.com/vb/content/ Saving..... Post Reply Close Saving..... Edit Comment Close Premium member Presentation Transcript Microsoft, SOA and the future: Microsoft, SOA and the future Daniel Akenine Architect Evangelist MicrosoftSystemutveckling - Trender: Systemutveckling - Trender Systemutveckling blir bara enklare och enklare… Systemutveckling blir bara svårare och svårare… Trend 1 Trend 2Slide3: Hypotes: Vi kan göra allt mer komplexa saker – därför gör vi det…Evolution: Evolution Polymorphism Encapsulation Subclassing Message-based Schema+Contract Binding via Policy 1980s 2000s Interface-based Dynamic Loading Runtime Metadata 1990s Object-Oriented Service-Oriented Component-BasedService orientation is a means for building distributed systems...: Service orientation is a means for building distributed systems... At its most abstract, service orientation views everything—from the mainframe application to the printer to the shipping dock clerk to the overnight delivery company—as a service provider... Service providers expose capabilities through interfaces. Service-oriented architecture maps these capabilities and interfaces so they can be orchestrated into processes The service model is "fractal": the newly formed process is a service itself, exposing a new, aggregated capability. Some SOA definitions SOA är ett ägg: SOA är ett ägg En lantbrukare föreställer sig en kyckling En kock ser en omelett Ett barn ser ett ägg att måla på Vad ser du ?Vad är SOA för Microsoft?: Vad är SOA för Microsoft? An approach to building systems using autonomous services which adhere to the 4 tenets of Service Orientation Boundaries are Explicit Services are Autonomous Services share schema and contract, not class Service compatibility is determined based on policy Tenet \Ten"et\, n. Any opinion, principle, dogma, belief, or doctrine, which a person holds or maintains as true. Source: Webster's Revised Unabridged Dictionary, © 1996, 1998The “service oriented world”: The “service oriented world”.NET : .NET User Experiences Web Services PCs and Smart Devices Infrastructure Identity Notification Application Center 2000 BizTalk Server 2000 Commerce Server 2000 Exchange 2000 SQL Server 2000 ISA Server 2000 Mobile Information 2001 Server Host Integration Server 2000 VisualStudio.NET .NET Framework Developer ToolsServices Distributed Objects: Services Distributed Objects Messages Agreements Programming Language Object Model Application Server Database Operating System Database Operating System Programming Language Object Model Application Server You Your Partner Tightly coupled distributed object solution Service Oriented ArchitectureSå hur passar objektorientering in ?: Så hur passar objektorientering in ? Object Orientation Assume homogeneous platform and execution environment Share classes, not schemas Assume cheap, transparent communication Are linked: Object identity and lifetime maintained by infrastructure Typically require deployment of both client and server in sync Are easy to talk about and become a natural path for customers to follow Customers have 20+ years of experience and great intuition about what “object oriented is” Service Orientation Assume heterogeneous platform and execution environment Share schemas, not classes Assume variable cost, explicit communication Are autonomous: Security and failure isolation are a must Ease “continuous deployment” of client and server separately Builds on ideas from component software, distributed objects, and MOM Dominant theme is to manage/reduce sharing between services Objektorientering är här för att stanna !Implementing SOA with Web Services : Implementing SOA with Web Services Integration: Integration Windows CLR .NET Security Adapters Orchestration ES MSMQ Linux JVM J2EE Security JCA ebXML JTA JMSVad har SOA för nackdelar ?: Vad har SOA för nackdelar ? Kräver mer design och modellering Kräver mer av systemutvecklaren Kräver mer teknik för säkerhet och transaktioner Vad vill jag säga ?: Vad vill jag säga ? Deployment Säkerhet Orkestrering Change Management Test Profiling Prestanda Modellering Slutsats:Utvecklingsverktygen MÅSTE hjälpa oss med att hantera den nya komplexiteten…: Slutsats: Utvecklingsverktygen MÅSTE hjälpa oss med att hantera den nya komplexiteten…Outinvesting Industry PeersTotal R&D Investments: Outinvesting Industry Peers Total R&D Investments Siebel .3 Microsoft Dell IBM Sun Oracle Intel HP Cisco Nokia Microsoft Pfizer J&J Novartis AstraZeneca Merck Pharmacy Company R&D Spend FY’03 (except Microsoft), $B Technology Company R&D Spend FY’03 (except Microsoft), $B *Forecast for FY’04; SAP BEA .1 .5Visual Studio Team System: Visual Studio Team System Visual Studio Team Foundation Visual Studio Team Architect Visual Studio Team Developer Visual Studio Team TestVisual Studio Team System: Visual Studio Team System Visual Studio Team Foundation Visual Studio Team Architect Visual Studio Team Developer Visual Studio Team TestTeam Architect: Team Architect Distributed Application Designer Whiteboard mode for application design Web Services Enhancements (WSE) support Validation against logical infrastructure Logical Infrastructure Designer Settings and constraints editor SDM generation and compiler Click-once support Class Designer Two-way code synchronizationApplication Designer: Application Designer Logical Infrastructure Designer: Logical Infrastructure DesignerClass Designer: Class DesignerMicrosoft SOA Technology : Framtiden Indigo Longhorn Federation Server Visual Studio 2007? (Orcas) Imorgon ASMX (VS2005 enhancements) WSE 3.0 Indigo (Beta) Visual Studio 2005 Longhorn (Beta) SQL Server 2005 Idag Microsoft SOA Technology ASMX (aka ASP.NET Web Services) Windows XP, Server 2003, .NET Visual Studio 2003 WSE 2.0 Office System 2003 BizTalk Server 2004 SQL Server 2000SOA Technology Roadmap: SOA Technology Roadmap Indigo kommer att ersätta nuvarande teknologier Andra teknologier kommer att fortsätta stödjas Indigo ASMX Enterprise Services .NET Remoting Com(+) MSMQ ASMX WSE1 WSE2 WSE-nRoad to Indigo Secure, Reliable, Transacted – ASP.NET: Road to Indigo Secure, Reliable, Transacted – ASP.NET class EntityService { [WebMethod] public void AddEntity( string entity ) { // Custom security X509CertificateCollection collection = new X509CertificateCollection(); IntPtr blob = Marshal.AllocHGlobal(Marshal.SizeOf( typeof(CRYPTOAPI_BLOB))); IntPtr data = (IntPtr)((int)blob + Marshal.SizeOf(typeof(CRYPTOAPI_BLOB))); . . . // Custom reliable messaging SeqAckRange range = new SeqAcknRange( id, low, high ); SeqAckRange[] ranges = { range }; ReliableQueue.ProcessAcks( ranges ); . . . // Custom DTC transaction context hr = pITxDispenser->BeginTransaction (NULL, ISOLATIONLEVEL_SERIALIZABLE, 0, pITxOptions, &pITransaction); . . . } }Road to Indigo Secure, Reliable, Transacted – WSE: Road to Indigo Secure, Reliable, Transacted – WSE class EntityService { [WebMethod] public void AddEntity( string entity ) { // Integrated WS-Security support foreach ( SecurityToken token in requestContext.Security.Tokens ) { X509SecurityToken x509 = token as X509SecurityToken; . . . } // Custom reliable messaging SeqAckRange range = new SeqAcknRange( id, low, high ); SeqAckRange[] ranges = { range }; ReliableQueue.ProcessAcks( ranges ); . . . // Custom DTC transaction context hr = pITxDispenser->BeginTransaction (NULL, ISOLATIONLEVEL_SERIALIZABLE, 0, pITxOptions, &pITransaction); . . . } }Road to IndigoSecure, Reliable, Transacted – Indigo: Road to Indigo Secure, Reliable, Transacted – Indigo [Confidentiality] [Reliability( Guarantees.ExactlyOnce | Guarantees.InOrder )] [Service] class EntityService { [TransactionCoupling( TransactionCouplingOptions.Required )] [ServiceMethod] void AddEntity( string entity ) { . . . } }Slutsatser :: Slutsatser : Alla IT leverantörer mobiliserar sig för SOA Microsoft och IBM är drivande Verktygen kommer att bli större, viktigare och hantera allt mer Slide31: Läs mer om SOA på: http://msdn.microsoft.com/architecture/soa/ http://www.microsoft.se/arkitekt Daniel Akenine dakenine@microsoft.comVisual Studio Team System: Visual Studio Team System Visual Studio Team Foundation Visual Studio Team Architect Visual Studio Team Developer Visual Studio Team TestTeam Developer: Team Developer Static code analysis Support for managed and native code Code profiling Sequence view examines running threads GC view of object allocation and lifetime Caller-callee, callstack, and function views Code coverage Integrated unit testing and frameworkStatic Code Analysis: Static Code AnalysisCode Coverage: Code CoverageUnit Testing: Unit TestingTeam DeveloperV2 Roadmap: Team Developer V2 Roadmap Runtime Analysis: System level profiling and application monitoring Integration of runtime analysis with operations Static Analysis: Editor integration (Squigglies) More rules & targetsVisual Studio Team System: Visual Studio Team System Visual Studio Team Foundation Visual Studio Team Architect Visual Studio Team Developer Visual Studio Team TestTeam Test: Team Test Load testing Web services load testing via protocol-based script Perf counter collection and threshold monitoring Test case managementLoad Testing Creation: Load Testing CreationLoad Testing: Load TestingTest Case Management: Test Case ManagementTeam TestV2 Roadmap: Team Test V2 Roadmap Functional UI Testing For Avalon, Windows.Forms, Win32, and IE Test Lab Management Setup, tear down, distribution, and baselining Historical Code Coverage Trends on a per-method basis Test Case PrioritizationVisual Studio Team System: Visual Studio Team System Visual Studio Team Foundation Visual Studio Team Architect Visual Studio Team Developer Visual Studio Team TestTeam Foundation: Team Foundation Work Item management Project management Microsoft Project and Excel integration Change management Branching, changesets, shelving Build Server Reporting and analytics Project portal Project creation and navigation Project Creation Wizard Process editor for customized guidanceWork Items Everywhere: Work Items EverywhereChange ManagementCheck In: Change Management Check InSlide48: Build Server Reporting: Reporting Project Portal: Project PortalProject Creation: Project CreationVad är SOA för Microsoft?: Vad är SOA för Microsoft? An approach to building systems using autonomous services which adhere to the 4 tenets of Service Orientation Boundaries are Explicit Services are Autonomous Services share schema and contract, not class Service compatibility is determined based on policy Tenet \Ten"et\, n. Any opinion, principle, dogma, belief, or doctrine, which a person holds or maintains as true. Source: Webster's Revised Unabridged Dictionary, © 1996, 1998Tenet 1: Boundaries are Explicit: Tenet 1: Boundaries are Explicit You know where the boundaries are Crossing service boundaries can be costly Consciously opt in to SOA Explicit message passing Agnostic to platform, middleware, language choicesTenet 2: Services are Autonomous: Tenet 2: Services are Autonomous Services in a system are deployed, managed, versioned independently Topology of a system evolves over time Services expect to run in the wild Consuming apps can and will fail Without notice or notification Mitigate with transactions, queues Assume probability of malformed or malicious messages Require signing, authentication Use trust relationships, not loginsTenet 3: Services Share Schema and Contract, not Class: Tenet 3: Services Share Schema and Contract, not Class Services interact solely on schemas for structures contract for behaviors Contracts and schema remain stable over time Ergo, schema and contract must be flexible Tenet 4: Service Compatibility is Determined Based on Policy : Tenet 4: Service Compatibility is Determined Based on Policy Structural compatibility (what we’ll say) separate from semantic compatibility (how we’ll say it) Services express capabilities and requirements in terms of a machine readable policy expression You do not have the permission to view this presentation. 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2 Microsoft 050210 SOA seminarium Sigismondo Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINTLite Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: (To copy code, click on the text box) Embed: URL: Thumbnail: WordPress Embed Customize Embed The presentation is successfully added In Your Favorites. Views: 379 Category: Education License: All Rights Reserved Like it (0) Dislike it (0) Added: February 20, 2008 This Presentation is Public Favorites: 0 Presentation Description No description available. Comments Posting comment... By: kallolchowdhury (15 month(s) ago) How interesting and amazing this post is! It is useful and helpful for me that I like it very much,and I am looking forward to hearing from your next. I have seen such kind of blog in another site. i.e. Architect Pavilion. You can take a tour in architect pavilion. I think it will help you to express your views. It is very usefull site for sw Architect , developers etc. The link is : http://www.architectpavilion.com/vb/content/ Saving..... Post Reply Close Saving..... Edit Comment Close Premium member Presentation Transcript Microsoft, SOA and the future: Microsoft, SOA and the future Daniel Akenine Architect Evangelist MicrosoftSystemutveckling - Trender: Systemutveckling - Trender Systemutveckling blir bara enklare och enklare… Systemutveckling blir bara svårare och svårare… Trend 1 Trend 2Slide3: Hypotes: Vi kan göra allt mer komplexa saker – därför gör vi det…Evolution: Evolution Polymorphism Encapsulation Subclassing Message-based Schema+Contract Binding via Policy 1980s 2000s Interface-based Dynamic Loading Runtime Metadata 1990s Object-Oriented Service-Oriented Component-BasedService orientation is a means for building distributed systems...: Service orientation is a means for building distributed systems... At its most abstract, service orientation views everything—from the mainframe application to the printer to the shipping dock clerk to the overnight delivery company—as a service provider... Service providers expose capabilities through interfaces. Service-oriented architecture maps these capabilities and interfaces so they can be orchestrated into processes The service model is "fractal": the newly formed process is a service itself, exposing a new, aggregated capability. Some SOA definitions SOA är ett ägg: SOA är ett ägg En lantbrukare föreställer sig en kyckling En kock ser en omelett Ett barn ser ett ägg att måla på Vad ser du ?Vad är SOA för Microsoft?: Vad är SOA för Microsoft? An approach to building systems using autonomous services which adhere to the 4 tenets of Service Orientation Boundaries are Explicit Services are Autonomous Services share schema and contract, not class Service compatibility is determined based on policy Tenet \Ten"et\, n. Any opinion, principle, dogma, belief, or doctrine, which a person holds or maintains as true. Source: Webster's Revised Unabridged Dictionary, © 1996, 1998The “service oriented world”: The “service oriented world”.NET : .NET User Experiences Web Services PCs and Smart Devices Infrastructure Identity Notification Application Center 2000 BizTalk Server 2000 Commerce Server 2000 Exchange 2000 SQL Server 2000 ISA Server 2000 Mobile Information 2001 Server Host Integration Server 2000 VisualStudio.NET .NET Framework Developer ToolsServices Distributed Objects: Services Distributed Objects Messages Agreements Programming Language Object Model Application Server Database Operating System Database Operating System Programming Language Object Model Application Server You Your Partner Tightly coupled distributed object solution Service Oriented ArchitectureSå hur passar objektorientering in ?: Så hur passar objektorientering in ? Object Orientation Assume homogeneous platform and execution environment Share classes, not schemas Assume cheap, transparent communication Are linked: Object identity and lifetime maintained by infrastructure Typically require deployment of both client and server in sync Are easy to talk about and become a natural path for customers to follow Customers have 20+ years of experience and great intuition about what “object oriented is” Service Orientation Assume heterogeneous platform and execution environment Share schemas, not classes Assume variable cost, explicit communication Are autonomous: Security and failure isolation are a must Ease “continuous deployment” of client and server separately Builds on ideas from component software, distributed objects, and MOM Dominant theme is to manage/reduce sharing between services Objektorientering är här för att stanna !Implementing SOA with Web Services : Implementing SOA with Web Services Integration: Integration Windows CLR .NET Security Adapters Orchestration ES MSMQ Linux JVM J2EE Security JCA ebXML JTA JMSVad har SOA för nackdelar ?: Vad har SOA för nackdelar ? Kräver mer design och modellering Kräver mer av systemutvecklaren Kräver mer teknik för säkerhet och transaktioner Vad vill jag säga ?: Vad vill jag säga ? Deployment Säkerhet Orkestrering Change Management Test Profiling Prestanda Modellering Slutsats:Utvecklingsverktygen MÅSTE hjälpa oss med att hantera den nya komplexiteten…: Slutsats: Utvecklingsverktygen MÅSTE hjälpa oss med att hantera den nya komplexiteten…Outinvesting Industry PeersTotal R&D Investments: Outinvesting Industry Peers Total R&D Investments Siebel .3 Microsoft Dell IBM Sun Oracle Intel HP Cisco Nokia Microsoft Pfizer J&J Novartis AstraZeneca Merck Pharmacy Company R&D Spend FY’03 (except Microsoft), $B Technology Company R&D Spend FY’03 (except Microsoft), $B *Forecast for FY’04; SAP BEA .1 .5Visual Studio Team System: Visual Studio Team System Visual Studio Team Foundation Visual Studio Team Architect Visual Studio Team Developer Visual Studio Team TestVisual Studio Team System: Visual Studio Team System Visual Studio Team Foundation Visual Studio Team Architect Visual Studio Team Developer Visual Studio Team TestTeam Architect: Team Architect Distributed Application Designer Whiteboard mode for application design Web Services Enhancements (WSE) support Validation against logical infrastructure Logical Infrastructure Designer Settings and constraints editor SDM generation and compiler Click-once support Class Designer Two-way code synchronizationApplication Designer: Application Designer Logical Infrastructure Designer: Logical Infrastructure DesignerClass Designer: Class DesignerMicrosoft SOA Technology : Framtiden Indigo Longhorn Federation Server Visual Studio 2007? (Orcas) Imorgon ASMX (VS2005 enhancements) WSE 3.0 Indigo (Beta) Visual Studio 2005 Longhorn (Beta) SQL Server 2005 Idag Microsoft SOA Technology ASMX (aka ASP.NET Web Services) Windows XP, Server 2003, .NET Visual Studio 2003 WSE 2.0 Office System 2003 BizTalk Server 2004 SQL Server 2000SOA Technology Roadmap: SOA Technology Roadmap Indigo kommer att ersätta nuvarande teknologier Andra teknologier kommer att fortsätta stödjas Indigo ASMX Enterprise Services .NET Remoting Com(+) MSMQ ASMX WSE1 WSE2 WSE-nRoad to Indigo Secure, Reliable, Transacted – ASP.NET: Road to Indigo Secure, Reliable, Transacted – ASP.NET class EntityService { [WebMethod] public void AddEntity( string entity ) { // Custom security X509CertificateCollection collection = new X509CertificateCollection(); IntPtr blob = Marshal.AllocHGlobal(Marshal.SizeOf( typeof(CRYPTOAPI_BLOB))); IntPtr data = (IntPtr)((int)blob + Marshal.SizeOf(typeof(CRYPTOAPI_BLOB))); . . . // Custom reliable messaging SeqAckRange range = new SeqAcknRange( id, low, high ); SeqAckRange[] ranges = { range }; ReliableQueue.ProcessAcks( ranges ); . . . // Custom DTC transaction context hr = pITxDispenser->BeginTransaction (NULL, ISOLATIONLEVEL_SERIALIZABLE, 0, pITxOptions, &pITransaction); . . . } }Road to Indigo Secure, Reliable, Transacted – WSE: Road to Indigo Secure, Reliable, Transacted – WSE class EntityService { [WebMethod] public void AddEntity( string entity ) { // Integrated WS-Security support foreach ( SecurityToken token in requestContext.Security.Tokens ) { X509SecurityToken x509 = token as X509SecurityToken; . . . } // Custom reliable messaging SeqAckRange range = new SeqAcknRange( id, low, high ); SeqAckRange[] ranges = { range }; ReliableQueue.ProcessAcks( ranges ); . . . // Custom DTC transaction context hr = pITxDispenser->BeginTransaction (NULL, ISOLATIONLEVEL_SERIALIZABLE, 0, pITxOptions, &pITransaction); . . . } }Road to IndigoSecure, Reliable, Transacted – Indigo: Road to Indigo Secure, Reliable, Transacted – Indigo [Confidentiality] [Reliability( Guarantees.ExactlyOnce | Guarantees.InOrder )] [Service] class EntityService { [TransactionCoupling( TransactionCouplingOptions.Required )] [ServiceMethod] void AddEntity( string entity ) { . . . } }Slutsatser :: Slutsatser : Alla IT leverantörer mobiliserar sig för SOA Microsoft och IBM är drivande Verktygen kommer att bli större, viktigare och hantera allt mer Slide31: Läs mer om SOA på: http://msdn.microsoft.com/architecture/soa/ http://www.microsoft.se/arkitekt Daniel Akenine dakenine@microsoft.comVisual Studio Team System: Visual Studio Team System Visual Studio Team Foundation Visual Studio Team Architect Visual Studio Team Developer Visual Studio Team TestTeam Developer: Team Developer Static code analysis Support for managed and native code Code profiling Sequence view examines running threads GC view of object allocation and lifetime Caller-callee, callstack, and function views Code coverage Integrated unit testing and frameworkStatic Code Analysis: Static Code AnalysisCode Coverage: Code CoverageUnit Testing: Unit TestingTeam DeveloperV2 Roadmap: Team Developer V2 Roadmap Runtime Analysis: System level profiling and application monitoring Integration of runtime analysis with operations Static Analysis: Editor integration (Squigglies) More rules & targetsVisual Studio Team System: Visual Studio Team System Visual Studio Team Foundation Visual Studio Team Architect Visual Studio Team Developer Visual Studio Team TestTeam Test: Team Test Load testing Web services load testing via protocol-based script Perf counter collection and threshold monitoring Test case managementLoad Testing Creation: Load Testing CreationLoad Testing: Load TestingTest Case Management: Test Case ManagementTeam TestV2 Roadmap: Team Test V2 Roadmap Functional UI Testing For Avalon, Windows.Forms, Win32, and IE Test Lab Management Setup, tear down, distribution, and baselining Historical Code Coverage Trends on a per-method basis Test Case PrioritizationVisual Studio Team System: Visual Studio Team System Visual Studio Team Foundation Visual Studio Team Architect Visual Studio Team Developer Visual Studio Team TestTeam Foundation: Team Foundation Work Item management Project management Microsoft Project and Excel integration Change management Branching, changesets, shelving Build Server Reporting and analytics Project portal Project creation and navigation Project Creation Wizard Process editor for customized guidanceWork Items Everywhere: Work Items EverywhereChange ManagementCheck In: Change Management Check InSlide48: Build Server Reporting: Reporting Project Portal: Project PortalProject Creation: Project CreationVad är SOA för Microsoft?: Vad är SOA för Microsoft? An approach to building systems using autonomous services which adhere to the 4 tenets of Service Orientation Boundaries are Explicit Services are Autonomous Services share schema and contract, not class Service compatibility is determined based on policy Tenet \Ten"et\, n. Any opinion, principle, dogma, belief, or doctrine, which a person holds or maintains as true. Source: Webster's Revised Unabridged Dictionary, © 1996, 1998Tenet 1: Boundaries are Explicit: Tenet 1: Boundaries are Explicit You know where the boundaries are Crossing service boundaries can be costly Consciously opt in to SOA Explicit message passing Agnostic to platform, middleware, language choicesTenet 2: Services are Autonomous: Tenet 2: Services are Autonomous Services in a system are deployed, managed, versioned independently Topology of a system evolves over time Services expect to run in the wild Consuming apps can and will fail Without notice or notification Mitigate with transactions, queues Assume probability of malformed or malicious messages Require signing, authentication Use trust relationships, not loginsTenet 3: Services Share Schema and Contract, not Class: Tenet 3: Services Share Schema and Contract, not Class Services interact solely on schemas for structures contract for behaviors Contracts and schema remain stable over time Ergo, schema and contract must be flexible Tenet 4: Service Compatibility is Determined Based on Policy : Tenet 4: Service Compatibility is Determined Based on Policy Structural compatibility (what we’ll say) separate from semantic compatibility (how we’ll say it) Services express capabilities and requirements in terms of a machine readable policy expression