© Copyright IBM Corporation 2014 Getting started with Rational Engineering Lifecycle Manager queries Andy Lapping – Technical sales and solutions Joanne Scouler – Curriculum architect

2 © Copyright IBM Corporation 2014 Agenda Linked data and Open Services for Lifecycle Collaboration (OSLC) The information model Basic concepts and terminology Linked data RDF Triples SPARQL Creating queries– live demo

3 © Copyright IBM Corporation 2014 Resources OSLC resources: Introduction to Linked Data and OSLCIntroduction to Linked Data and OSLC by Amanda Brijpaul Linked DataLinked Data by Ben Williams Linked Data InterfacesLinked Data Interfaces by Arthur Ryman REST resources: DeveloperWorks REST resourcesDeveloperWorks REST resources – The Basics Learn about rest web services RDF, TRS, SPARQL, LQE-

4 © Copyright IBM Corporation 2014 Rational engineering lifecycle manager Transition to a unified view on project, program & account info It is about accessing related information in job related tools across the information base to increase the collective wisdom Analysts Quality Professionals Release Engineers Developers Architects Project Managers

5 © Copyright IBM Corporation 2014 Linked data in Rational engineering lifecycle manager Electrical Design Mechanical Design / PDM Embedded Software Design about HTTP/REST Requirements Test Architecture Change Products The Web has proven to be the most scalable, open, and flexible integration technology

6 © Copyright IBM Corporation 2014 OSLC links Link directly between tools – no need to import or duplicate data

7 © Copyright IBM Corporation 2014 Demo linked data

8 © Copyright IBM Corporation 2014 Data is indexed in Rational engineering lifecycle manager An index of tracked resources is created from domain tools that allows for cross-domain Lifecycle Queries Lifecycle Query Engine (Index)

9 © Copyright IBM Corporation 2014 The information model  What information do you want to find with a query?  Know your information model  Know how your linkages are set up  What do you need to know before writing a query?

10 © Copyright IBM Corporation 2014 Learning the language RDF – Resource Description Framework  A general purpose language for representing information in the web SPARQL - SPARQL Protocol and RDF Query Language  A query language for RDF TRS – Tracked Resource Set  TRS is an OSLC specification that allows server applications to make their resources and changes available to client applications. LQE – The Lifecycle Query Engine  A TRS client application

11 © Copyright IBM Corporation 2014 Running queries  Query results available in http format  Pipes (XML) data to Rational Reporting for Document Generation (RRDG) / Rational Publishing Engine (RPE)

12 © Copyright IBM Corporation 2014 Basic concept: triples A triple defines a relationship between things:  Subject – A uniquely identified thing  Predicate (also called property) – Some attribute of the subject – Denotes a relationship  Object – The actual value

13 © Copyright IBM Corporation 2014 Triples Examples: subject object predicate subject object predicate

14 © Copyright IBM Corporation 2014 RDF triples An RDF triple is sometimes called a statement  Every piece of an RDF triple can have a URL  Commonly referred to as a resource SP O

15 © Copyright IBM Corporation 2014 RDF triples form graphs A set of triples is called an RDF graph  Graphs have nodes and edges  An RDF database is sometimes called a triple store Node Edge

16 © Copyright IBM Corporation 2014 Types of node Resource node  A thing with a URL with links – Commonly represented as an oval Blank node  A resource with no URL with links Literal node  A value (strings, dates) - no URL and no links – Commonly represented as a rectangle An edge can go from any Node to any other Node. Exception: An edge cannot go from a Literal

17 © Copyright IBM Corporation 2014 Triple patterns A triple pattern is like an RDF triple – except that each of the S,P,O may be a variable (denoted by a preceding ? symbol) ?resource rdf:type oslc_qm:TestCase. Variable Variables are like a wildcard – they match any node – resource or literal. The period terminates the statement We will discuss what rdf:type and oslc_qm:TestCase mean in a moment

18 © Copyright IBM Corporation 2014 RDF vocabularies In order for ‘anything’ to connect to ‘anything else’ – there must be some common language.  An RDF Vocabulary is the set of URLs for the resources in the graph ?resource From the OSLC Quality Management Vocabulary From the standard RDF vocabulary

19 © Copyright IBM Corporation 2014 Prefixes Prefixes are used in SPARQL to allow queries to be shortened (instead of writing the full URL to the resource)  The following queries are equivalent ?uri ?tests_cr. PREFIX oslc_qm: ?uri oslc_qm:testsChangeRequest?tests_cr. SPO SPO

20 © Copyright IBM Corporation 2014 Anatomy of a query PREFIX oslc_qm: PREFIX dcterms: PREFIX rdf: SELECT ?uri WHERE { ?uri rdf:type oslc_qm:TestCase. } SELECT ?variable ?variable Identifies the variables to appear in the results (this is called projection) Each projected variable will be a column in the results table SELECT * will display all variables specified in the WHERE clause WHERE { basic graph pattern } Identifies the basic graph pattern to match against the data pattern

21 © Copyright IBM Corporation 2014 A simple query with results PREFIX oslc_qm: PREFIX dcterms: PREFIX rdf: SELECT ?uri WHERE { ?uri rdf:type oslc_qm:TestCase. } Pattern matches Projected ?uri variable

22 © Copyright IBM Corporation 2014 Queries

23 © Copyright IBM Corporation 2014 Creating a query When a query is created some sample SPARQL is added Although this can be executed the results will mean very little

24 © Copyright IBM Corporation 2014 Create queries demo

25 © Copyright IBM Corporation 2014 Appendix

26 © Copyright IBM Corporation 2014 Blank nodes in Rhapsody Using this technique we can discover how to extract various resources in Rhapsody Some may have multiple blank nodes to traverse