10 SIM and ReL

7/28/2019 10 SIM and ReL

http://slidepdf.com/reader/full/10-sim-and-rel 1/42

Dr. Philip Cannata 1

SIM Data Model and ReL

7/28/2019 10 SIM and ReL



Semantic Data Models

2/88

7/28/2019 10 SIM and ReL



Doug Tolbert

[email protected]

Doug Tolbert has been involved with OMG since the early 1990s. He is a member of the Board of

Directors and currently holds a Platform seat on the Architecture Board. Doug was a principal

member of the team that developed CWM, and he has made contributions to many OMG platform

(UML, MOF, XMI, IMM, SOA, Alf, and ADTF) and domain (Finance, Life Science, Insurance) over

the years. He is currently active on the UML Simplification and IMM submission teams. On the AB,

Doug works to ensure that OMG specifications are clear and understandable in both their human- and

machine-readable forms.

mailto:[email protected]

mailto:[email protected]

7/28/2019 10 SIM and ReL



7/28/2019 10 SIM and ReL



SIM Example: Organization Schema

Person

Project-Employee Manager

Department

Assignment

EmployeePrevious-Employee

SpouseChild

Parent

Employee-Manager

Employees-Managed

Projects-ManagingProject-Manager

Dept-Assigned

Project-Of

Assignment-HistoryStaff-Assigned

Assignment-Record

Dept-Staff Dept-In

Interim-Manager

Start-Date Assignment-No

End-Date Rating

Est-Person-Hours

S u b -P r o j e c t s

S u b -P r o j e c t - Of

Project(Next-Project-No)Project-NoProject-Title

Manager-TitleBonus

Interim-History(Start-Date,

End-Date) MV

Employee-IDEmployee-Hire-Date

Employee-SalaryEmployee-Status

Dept-NoDept-TitleDept-Location

TitleOverall-Rating

Termination-ReasonLeave-StatusLast-Work-Date Hire-Date

Name (First-Name, Mid-Initial, Last-Name)Current-Residence (Street, City, State, ZipCode)Education (Degree-Obtained, Year-Obtained, GPA) MVNext-of-Kin (Relationship, Phone, Name-Of-Kin (First-Name, Mid_Initial, Last-Name))Marital-Status US-Citizen Soc-Sec-NoBirth-Date Gender Age

7/28/2019 10 SIM and ReL



SIMOrigins and Evolution

Doug Tolbert

Unisys Corporation

Mission Viejo, CA

Unisys Server Enterprise

Division

7/28/2019 10 SIM and ReL

http://slidepdf.com/reader/full/10-sim-and-rel 7/42Dr. Philip Cannata 7

SIM Motivations: Objectives (1983)

Ease of Use

Productivity

Data Integrity

Coexistence

Performance

• Integrated, high level interface

• Query & schema flexibility

• Data Independence

• Set-oriented, non-procedural

interface

• Naturally handle complexity

• Easy to learn

• Minimal programming effort

• Retrieval without programming

• System enforced integrity

• Shared data definitions

• Referential integrity

• No impact on DMS II customer

base

• New capabilities for existingdata

• Must support production level

transaction processing systems

• Fast

• Fast

• Fast

7/28/2019 10 SIM and ReL


SIM Motivations: Options (1983)

Enhance DMS

II

Relational System Something New

• Improve ease of use

• Gain productivity &

data integrity without

sacrificing installed

base

• Performance thought

to be near

architectural limits

(but wasn’t true!)

• Not likely to expand

customer base

• Ease of use would

improve

• Productivity gains

marginal• Data integrity very

limited

• Extensive data

engine rework

•

No migration path for customer base

• Performance?

• Late to market

• Designed to meet

Ease of use,

productivity, and data

integrity goals

• New features for

existing databases

without migration

• Performance based

on proven DMS II

algorithms

• Semantic Data Model

provided best

framework

7/28/2019 10 SIM and ReL


SIM: Something New!

Artificial Intelligence

Semantic NetworksQuillian, Brachman

SIMGraphical Data Models

Entity RelationshipChen

Set Data Models

RM/TCodd

Query Languages

GORDASEl-Masri

Semantic Models

SDMHammer & McLeod

Programmatic Model

DAPLEXShipman

7/28/2019 10 SIM and ReL


SIM: A Semantic Data Model

What makes a data model“semantic”?

“During the last few years numerous

investigations have been aimed at capturing

(in a reasonably formal way) more of the

meaning of the data, while preserving

independence of implementation. Thisactivity is sometimes called semantic data

modelling . Actually, the task of capturing

the meaning of data is a never-ending one.

So the label ‘semantic’ must not be

interpreted in a absolute way.”

-- E. F. Codd, 1979

• SDMs capture the meaning of data,

not just its physical representation

• So, the more meaning a data model

captures, the more “semantic” it is

How does a semantic data modelcapture meaning?

“... it is appropriate that the structure of a

database mirror the structure of the system

that it models. A database whose

organization is based on naturally occurring

structures will be easier for a databasedesigner to construct and modify than one

that forces him to translate the primitives of

his problem domain into artificial

specification construction.”

-- Hammer & McLeod, 1981

• Schema objects should look likecorresponding real world objects

• Meaning captured by object types,

relationships, attribute types,

cardinality constraints, active rules

7/28/2019 10 SIM and ReL


SIM Concepts: Entities & Attributes

Entity An object or idea of interest in the

application environment

Does not imply a particular physicalimplementation

But functional analogs are recordsand tuples in other data models

e.g., The employee named John Doe

The Accounting department Attribute

A characteristic of an entity

John Doe has an address, an employeeID, a salary, ...

7/28/2019 10 SIM and ReL


SIM Concepts: Classes & Subclasses

Class A collection of entities of the

same type

Employee, the set of allemployees working for acompany

Subclass A subset of entities in a class

Project-Employees are

employees that work onprojects

Employee

Project-Employee

ISA

7/28/2019 10 SIM and ReL


SIM Concepts: Attributes

Attribute Inheritance

Subclasses inherit attributes from

all their superclasses

Subclasses may declare additional

attributes

Attribute Types

Data-Valued Attributes (DVA)

Have a printable value

Entity-Valued Attributes (EVA)

Entities in another class

Model relationships

Employee Name EmployeeID

Project-EmployeeTitle

Department

Dept- I n

7/28/2019 10 SIM and ReL


SIM Concepts: Extended Attributes

Perspective Class

A point of view class chosen

for a query

Same data may have different

meanings from different

perspective classes

Extended Attributes

Attributes of related entities

may be considered

extended attributes of theperspective class

Employee Name

EmployeeID


Department Dept-No

Dept-

I

n

Dept-No of Dept-In of Project-Employee = 123

Dept-No of Department = 123

7/28/2019 10 SIM and ReL


SIM Concepts: Constraints & Relations

Attribute ConstraintsIsomorphic for EVA/DVA

Single-Valued

Multi-Valued

RequiredUnique

Relationships (EVAs)

Always bi-directional

Automatic referential integrity

Transitive closure function

Employee Name

EmployeeID


Department Dept-No

Dept-

I

n

Title of INVERSE(Dept-In) of Department

Title of Dept-Staff of Department

Dept-Staff

7/28/2019 10 SIM and ReL


SIM Concepts: Data Types

Class Attributes

One value per class, not associated with any entity, DVA only

Data Types

Similar to Pascal, with relaxed string type checking

System Defined User Defined

• Integer

• Real

• Boolean

• Date

• Time

• Character

• Number

• String (fixed)

• String (variable)

• Kanji

• Symbolic

• Ordered Symbolic

• Based on system defined types

• Set membership for strings

WeekDay : String(“Mon”, ..., “Fri”)

• Enforced subrange

Employee-Age : Integer(18..70)

7/28/2019 10 SIM and ReL


SIM Concepts: Verify

Verify

General constraints not related to schema structure

Full power of SIM expression syntax in WHERE clause

For example

Spouses of employees hired after December 31, 1995,may not work for the company

VERIFY NoCouples ON Employee

ASSERT Not (Spouse ISA Employee)

WHERE Employee-Hire-Date > 12/31/95

ELSE “Spouse may not work for company”

7/28/2019 10 SIM and ReL


SIM Concepts: Security

Security

Accesses limit visibility of and operations on attributes

Permissions associate Accesses with users or programs

For example

The Accounting Department may examine but not change the salary of journeyman and higher employees

ACCESS LookButDontTouch ON Employee (Employee-Salary)

RETRIEVE

WHERE Employee-Status >= Journeyman

PERMISSION USERCODE = Accounting, ACCESS = LookButDontTouch

7/28/2019 10 SIM and ReL


7/28/2019 10 SIM and ReL


SIM Concepts: Expressions

OperatorsArithmetic +, -, *, /, DIV, MOD, **Boolean NOT, AND, OR Relational <, >, =, <=, >=, <>String &, pattern matchingExistence EXISTS

FunctionsArithmetic ABS, ROUND, TRUNC, SQRTString LENGTH, EXT, POS, RPTSymbolic PRED, SUCCDate YEAR, MONTH, DAY, ELAPSED_DAYS, ADD_DAYS, DAY_OF_WEEK,

MONTH_NAME, CURRENT_DATETime HOUR, MINUTE, SECOND, ELAPSED_TIME, ADD_TIME, CURRENT_TIMERelationships INVERSE, TRANSITIVE

Multi-ValuedOperators INCLUDE, EXCLUDEAggregates AVG, SUM, COUNT, MIN, MAXQuantifiers SOME, ALL, NO

7/28/2019 10 SIM and ReL


SIM Concepts: Advanced Query Topics

Subrole Attribute (Readonly enumeration of subclasses in a

class)

Role Testing

Role Qualification

Retrieve the names of employees that are managers. RETRIEVE Name of EmployeeWHERE Profession = Manager

Retrieve the names of employees whose spouses are managers. RETRIEVE Name of EmployeeWHERE Spouse ISA Manager

Retrieve the names of US citizens and the employee IDs of their spouses. RETRIEVE Name of Person, Employee-ID of Spouse AS EmployeeWHERE US-Citizen

7/28/2019 10 SIM and ReL


SIM Concepts: Advanced Query Topics

Multiple Perspective Queries (aka Joins)

Reference Variables

Local Selection

Retrieve the names of project employees and managers that are the same age. RETRIEVE Name of Project-Employee, Name of Manager WHERE Age of Project-Employee = Age of Manager

Retrieve the names of all managers who manage employees making more than$40,000 and employees making less than $20,000. RETRIEVE Name of Manager WHERE Employee-Salary of Employees-Managing > 40000AND Employee-Salary of Employees-Managing CALLED Underpaid < 20000

Retrieve the names of managers of all departments and the salaries of onlythe division managers. RETRIEVE Name of Dept-Managers of Department,

Employee-Salary of Dept-Managers WITH(Manager-Title of Dept-Managers = Division-Manager)

7/28/2019 10 SIM and ReL



SIM Concepts: Update

Insert Entity: Create a new employee named John Doe and assign him to the manager named Smith.INSERT Employee(Name := (First-Name := “John”, Last-Name := “Doe”), Gender := Male,Soc-Sec-No := 123-45-6789, US-Citizen := True, Employee-ID := 726478,Spouse := Person WITH (First-Name of Name = “Mary”AND Last-Name of Name = “Doe”),Child := INCLUDE Person WITH (First-Name of Name = “Junior ”AND Last-Name of Name = “Doe”),Employee-Manager := Manager WITH (Last-Name of Name = “Smith”)

Insert Role: Promote John Doe to department manager with a bonus of $5000.INSERT Manager FROM Employee WHERE Last-Name of Name = “Doe”

(Manager-Title := Department-Manager, Bonus := 5000)

Modify: Reassign all Journeyman Project-Employees in the Construction Department to the MaintenanceDepartment.

MODIFY Project-Employee (Dept-In := Department WITH (Dept-Title = “Maintenance”))

WHERE Title = Journeyman AND Dept-Title of Dept-In =“Construction

”

Delete: Remove all projects assigned to managers that manage departments located in Los Angeles.DELETE ProjectWHERE Dept-Location of Managers-Department of Project-Manager = “Los Angeles”

7/28/2019 10 SIM and ReL



SIM Example

Organization: a projects and employee database

Database descriptions

DMS II A record oriented DBMS

DB2 A relational DBMSSIM A semantic DBMS

Query Comparisons

Three retrieval queries of increasing complexity

Application program sizes

7/28/2019 10 SIM and ReL



SIM Example

Organization Basic FactsEmployees are People

Project-Employees are Employees who are assigned to

Projects

Managers are Employees who manage Projects

Sometimes a Project-Employee can act as a Manager

on an interim basis

Projects may have Subprojects

Historical records of Previous Employees must be

retained

7/28/2019 10 SIM and ReL



SIM Example: DMS II Schema

Soc-Sec-NoSpouse-SSNManagers-SSNAssignment-NoDept-NoEmployedEmployee-ID

Person

Person-Set Employee-IDProject-No

Project-Person

ProjPerson-Set

Soc-Sec-No

Education

Education-Set

Assignment-NoProject-No

Assignment

Assignment-Set

Dept-No

Department

Department-Set

Parent-SSNChild-SSN

Family

Family-Set

Employee-ID

Interim-Manager

Interim-Set

StartDate

EndDate

Duration

InterimHist-Set

Project-NoDept-NoSuperProject-No

Project-Set

Project

Attributes

Data Set Name

Primary Index

Legend

7/28/2019 10 SIM and ReL



SIM Example: DB2 Schema

Soc-Sec-NoSpouse-NoManagers-SSNAssignment-No

Dept-NoEmployedEmployee-ID

Person

Soc-Sec-No

Education

Assignment-NoProject-No

Assignment

Dept-No

Department

Parent-SSNChild-SSN

Family

Project-NoDept-NoSuperProject-No

Project

Employee-IDStartDateEndDate

Interim-History

Employee-IDProject-No

Project-Person

Column Name

Table Name

Legend

7/28/2019 10 SIM and ReL



SIM Example: Organization Schema

Person

Project-Employee Manager

Department

Assignment

EmployeePrevious-Employee

SpouseChild

Parent

Employee-Manager

Employees-Managed

Projects-ManagingProject-Manager

Dept-Assigned

Project-Of

Assignment-HistoryStaff-Assigned

Assignment-Record

Dept-Staff Dept-In

Interim-Manager

Start-Date Assignment-No

End-Date Rating

Est-Person-Hours

S u b -P r o j e c t s

S u b -P r o j e c t - Of

Project(Next-Project-No)Project-NoProject-Title

Manager-TitleBonus

Interim-History(Start-Date,End-Date) MV

Employee-IDEmployee-Hire-DateEmployee-Salary

Employee-Status

Dept-NoDept-TitleDept-Location

TitleOverall-Rating

Termination-ReasonLeave-StatusLast-Work-Date Hire-Date

Name (First-Name, Mid-Initial, Last-Name)Current-Residence (Street, City, State, ZipCode)Education (Degree-Obtained, Year-Obtained, GPA) MVNext-of-Kin (Relationship, Phone, Name-Of-Kin (First-Name, Mid_Initial, Last-Name))Marital-Status US-Citizen Soc-Sec-NoBirth-Date Gender Age

7/28/2019 10 SIM and ReL



SIM Example: Comparison Queries

Simple Query

Print the names of all non-managers and the title of the department

in which they work.

Complex Query

Print the names of employees and the titles of all their projects if

they work on any project assigned to the Accounting Department.

Hard Query

For the Annual Report Preparation project, print the titles of its

subprojects and the names of employees currently assigned.

7/28/2019 10 SIM and ReL



SIM Example: Simple Query

DMS II

RELATE Person TO Department BY MATCHING Dept-No WITH Dept-No AS Person-Dept;TAB First-Name, Mid-Initial, Last-Name, Dept-TitleWHERE Employed NEQ “Manager ” FROM Person TO Department;

DB2

SELECT First-Name, Mid-Initial, Last-Name, TitleFROM Person, DepartmentWHERE Person.Dept-No = Department.Dept-NoAND Person.Employed NEQ “Manager ”;

SIM

RETRIEVE Name of Project-Employee, Dept-Title of Dept-In

Print the names of all non-managers and the title of the department in which they work.

7/28/2019 10 SIM and ReL



SIM Example: Complex Query

DMS II

RELATE Department TO Project BYMATCHING Dept-NoWITH Dept-No AS Dept-Proj;

RELATE Project TO Project-Person BYMATCHINGProject-No WITH Project-No AS Proj-Person;

RELATE Project-Person TO Person BYMATCHINGSoc-Sec-No WITH Soc-Sec-No AS Proj-Emp;

DB2SELECT FIrst-Name, MId-Initial, Last-Name, Project-TitleFROM Person, Project-Person, ProjectWHERE Person.Soc-Sec-No = Project-Person.Soc-Sec-NoAND Project.Project-No = Project-Person.Project-NoAND EXISTS (SELECT *

FROM Project-Person, Project, DepartmentWHERE Project-Person.Soc-Sec-No = Person.Soc-Sec-No

AND Project-Person.Project-No = Project.Project-NoAND Department.Dept-No = Project.Dept-NoAND Department.Dept-Title = “Accounting”)

SIM

RETRIEVE Name of Project-Employee, Project-TItle of Current-ProjectWHERE Dept-TItle of SOME(Dept-Assigned of Current-Project) = “Accounting”

Print the names of employees and the titles of all their projects if they work on any projectassigned to the Accounting Department.

EXTRACT Soc-Sec-No, COUNT AS SSN-Cnt WHEREDept-TItle “Accounting” FROM Person TOProject-Person TO Project TO Department :

EXTRACTFILE = ExtFile;OPEN FILE ExtFile;RELATE ExtFile TO Project-Person BY MATCHING

Soc-Sec-No WITH Soc-Sec-No AS Extrel;

TAB First-Name, Mid-Initial, Last-Name, Project-Tit leFROM ExtFile TO Project-Person TO ProjectWHERE SSN-Cnt > 0;

7/28/2019 10 SIM and ReL



SIM Example: Hard Query

DMS II

OPEN DMSII Oranization;OPEN DMSII OrgCopy (DMI

=DMINTERPRETER/ORGANIZATION);

RELATE Project of Organization TO Project of OrgCopyBYMATCHING Project-No WITH SuperProject-NoASSubProj;

RELATE Project of Organization TO Person of OrgCopyBYMATCHING Project-No WITH Project-No ASProject-Emp;

DB2

SELECT Project-Title, First-Name, Mid-Initial, Last-NameFROM Project, Project, SubProj, Person, Project-PersonWHERE Project.Project-No = SubProj.SuperProject-No

AND SubProj.Project-No = Project-Person.Project-NoAND Project-Person.Soc-Sec-No = Person.Soc-Sec-NoAND Project.Project-Title = “Annual Report Preparation”

SIM

RETRIEVE Project-Title of Sub-Projects of Project, Name of Project-Team of Sub-ProjectsWHERE Project-Title of Project = “Annual Report Preparation”

For the Annual Report Preparation project, print the titles of its subprojects and the namesof employees currently assigned.

RELATE Project-Person of OrgCopy TO Person of OrgCopyBY MATCHING Employee-ID WITH Employee-IDAS Proj-Person;

TAB Project-Tit le of Project of OrgCopy, First-Name of Person of OrgCopy, Mid-Initial of Person of OrgCopy, Last-Name of Person of OrgCopy

FROM Project of Organization TO Project of OrgCopy TOProject-Person of OrgCopy TO Person of OrgCopyWHERE Project-Title of Project of Organization =

“Annual Report Preparation”

7/28/2019 10 SIM and ReL



mgr

SIM - Semantic Data Management

7/28/2019 10 SIM and ReL



CLASS person

( ss_num: INTEGER, REQUIRED;

name: STRING;);

SUBCLASS emp OF person

( job : STRING;

mgr : emp, SV, INVERSE IS employees;

sal : INTEGER;

comm : INTEGER;

dept : dept, SV, INVERSE IS employees;

);

CLASS dept

( deptno : INTEGER, REQUIRED;

dname : STRING;

loc : STRING;

employees : emp, MV, INVERSE IS dept;

);mgr

SIM - Semantic Data Management

CLASS

7/28/2019 10 SIM and ReL



CLASS person

(

ss_num: INTEGER, REQUIRED;

name: STRING;

);

SUBCLASS emp "Employees of a company" OF person

(

job : STRING;

mgr : emp, SV, INVERSE IS employees;

employees : emp, MV, INVERSE IS mgr;

sal : INTEGER;

comm : INTEGER;

dept : department, SV, INVERSE IS employees;);

INSERT emp ( ss_num:= 7369 , name := "SMITH" , job := "CLERK" , sal := 800 );

INSERT emp ( ss_num:= 7499 , name := "ALLEN" , job := "SALESMAN" , sal := 1600 , comm := 300 );

INSERT emp ( ss_num:= 7521 , name := "WARD" , job := "SALESMAN" , sal := 1250 , comm := 500 );

INSERT emp ( ss_num:= 7566 , name := "JONES" , job := "MANAGER" , sal := 2975 );

INSERT emp ( ss_num:= 7654 , name := "MARTIN" , job := "SALESMAN" , sal := 1250 , comm := 1400 );

INSERT emp ( ss_num:= 7698 , name := "BLAKE" , job := "MANAGER" , sal := 2850 );INSERT emp ( ss_num:= 7782 , name := "CLARK" , job := "MANAGER" , sal := 2450 );

INSERT emp ( ss_num:= 7788 , name := "SCOTT" , job := "ANALYST" , sal := 3000 );

INSERT emp ( ss_num:= 7839 , name := "KING" , job := "PRESIDENT" , sal := 5000 );

INSERT emp ( ss_num:= 7844 , name := "TURNER" , job := "SALESMAN" , sal := 1500 );

INSERT emp ( ss_num:= 7876 , name := "ADAMS" , job := "CLERK" , sal := 1100 );

INSERT emp ( ss_num:= 7900 , name := "JAMES" , job := "CLERK" , sal := 950 );

INSERT emp ( ss_num:= 7902 , name := "FORD" , job := "ANALYST" , sal := 3000 );

INSERT emp ( ss_num:= 7934 , name := "MILLER" , job := "CLERK" , sal := 1300 );

7/28/2019 10 SIM and ReL



CLASS department "Departments of a company"(

deptno : INTEGER, REQUIRED;

dname : STRING;

loc : STRING;

employees : emp, MV, INVERSE IS dept;

);

INSERT department ( deptno := 10 , dname := "ACCOUNTING" , loc := "NEW YORK" );

INSERT department ( deptno := 20 , dname := "RESEARCH" , loc := "DALLAS" );

INSERT department ( deptno := 30 , dname := "SALES" , loc := "CHICAGO" );

INSERT department ( deptno := 40 , dname := "OPERATIONS" , loc := "BOSTON" );

7/28/2019 10 SIM and ReL



MODIFY emp ( dept := department WITH (deptno = 20) ) WHERE ss_num = 7369 ;





MODIFY emp ( dept := department WITH (deptno = 30) ) WHERE ss_num = 7698 ;MODIFY emp ( dept := department WITH (deptno = 10) ) WHERE ss_num = 7782 ;






MODIFY emp ( dept := department WITH (deptno = 20) ) WHERE ss_num = 7902 ;MODIFY emp ( dept := department WITH (deptno = 10) ) WHERE ss_num = 7934 ;

MODIFY emp ( mgr := emp WITH (ss_num = 7902) ) WHERE ss_num = 7369 ;




MODIFY emp ( mgr := emp WITH (ss_num = 7698) ) WHERE ss_num = 7654 ;MODIFY emp ( mgr := emp WITH (ss_num = 7839) ) WHERE ss_num = 7698 ;






MODIFY emp ( mgr := emp WITH (ss_num = 7566) ) WHERE ss_num = 7902 ;MODIFY emp ( mgr := emp WITH (ss_num = 7782) ) WHERE ss_num = 7934 ;

7/28/2019 10 SIM and ReL



WDB> from person retrieve * where true;

WDB> from emp retrieve * where true;

7/28/2019 10 SIM and ReL



WDB> from emp retrieve * where true; WDB> from department retrieve * where true;

WDB> from emp retrieve *, * of dept where true;

7/28/2019 10 SIM and ReL



WDB> from emp retrieve ss_num, name, dname of dept, name of mgr, dname of dept of mgr

where true;

7/28/2019 10 SIM and ReL



with ReL

7/28/2019 10 SIM and ReL


ReL Components

Python.g

SPARQLDoer.java

PyTuple.java------------ parseSIM()

AST

Runtime Stack

SIMHelper.java

Visitor

SQLVisitor.java

jSQLParser

Interpreter

jSIMParser

CodeCompiler.java

The Python grammar waschanged to include SIM, SQL,

Prolog, and ASP statements.

The Tuple entry in

CodeCompiler was

modified to deal with putting SIM, SQL, Prolog,

and ASP information and

expressions on the runtime

stack and to assure that a

new instance of PyTuple is

created after the

expressions are evaluated.

jSQLParser parses SQL

statements from PyTuple and

produces an AST that can be

visited.

SQLVisitor visits the

jSQLParser AST and

produces appropriate

SPARQL statements for the

parseSIM parses SIM

statements from PyTuple and

produces and passes AS

information to SIMHelper.

SIMHelper produces

appropriate SPARQL

statements for the SIM

statements which are sent to

SPARQLDoer.

There is no jSIMParser to

parse SIM statements like

jSQLParser for SQL but I

hope one will be built as a

project.

Date post:	03-Apr-2018
Category:	Documents
Upload:	mnscali
View:	214 times
Download:	0 times

10 SIM and ReL

Documents