Section A: Multiple Choice

Transcription

1 Section A: Multiple Choice Question 1 Each item has only one correct answer. Two marks for each correct answer, zero marks for each incorrect answer. Use the supplied sheet to record a single response to each question. (40 marks) 1) In a Relational database, foreign keys in the rows of a table A. Must refer to a different table B. Cannot have the same value in two or more rows C. Must be related to a primary key in a related table D Must have a numeric value 2) In defining in SQL database, a one-to-many relationship is implemented by A. One or more foreign keys B. An index C. A link table D. An auto-increment column For questions 3-5 assume a database has the following two tables Primary key fields are marked with # and foreign keys have the same name as their corresponding primary keys. Programme (progname#, server, OS) Test (testno#, progname, description, status) 3) Which SQL statement will return the descriptions of all tests? A. select * from Test B. select description from Test C. select descriptions from Test D. select * from Test.description 4) Which SQL statement will return all programmes running on the Vista OS? A. select * from Programme B. select * from Programme where OS = Vista C. select * from Programme[OS='Vista'] D. select * from Programme where OS = 'Vista' Page 1 of 12

2 5) Which SQL statement will list all tests on the server 'Firefly'? A. select * from Test where server = 'Firefly' B. select * from Test, Programme where server = 'Firefly' C. select * from Test natural join Programme where server='firefly' D. select server='firefly' from Test, Programme where Test.progname=Programme.progname 6) XML is A. a vocabulary B. a grammar C. a programming language D. a PHP enabled document 7) Which of the following IS a well-formed XML fragment? A. <programme><test id='3'>opera</programme> B. <test author=fred>test quit on error</test> C. <server><os name='xp'/><os name="solaris"/></server> D. <prog><name>edituser</name><author>bob</author></prog> 8) Namespaces in XML A. connect an XML document to a schema B. distinguish between different vocabularies in the same document C. define the root node in an XML document D. define the rules for constructing tag names 9) Comments in XML are coded as A. <!-- This part uses recursion --> B. /* This part uses recursion */ C. (: This part uses recursion :) D. <comment> This part uses recursion </comment> 10) Comments in XQuery are coded as A. <!-- This part uses recursion --> B. /* This part uses recursion */ C. (: This part uses recursion :) D. <comment> This part uses recursion </comment> Page 2 of 12

3 11) Which statement about XSLT is FALSE? A. XSLT is an XML vocabulary B. XSLT output must be XML C. XSLT uses XPath D. XSLT supports pattern-based matching 12) XSLT is A... an object oriented programming language B... a procedural programming language C... a XML mark-up vocabulary D... a functional programming language 13) RSS is an XML standard for A. Defining map overlays B. Representing Real time event streams C. News items D. Defining layout in a web page. For items 14 to 16, consider the following XML fragment: <basket id=' '> <category id='dvd'> <item id=' '> <title asin='b004dcad94'>let Me In</title> <price curr='gbp'>9.99</price> <quantity>1</quantity> </item> </category> <category id='bluray'> <item id=' '> <title asin='b004a95u0w'>amer</title> <price curr='gbp'>12.99</price> <quantity>1</quantity> </item> </category> </basket> 14) The XPath expression to find the price of the disc called Amer is A. /item/title='amer"/price B. //item[title="amer"]/price C. //item/[title="amer"]/../price D. /item/price[title="amer"] Page 3 of 12

4 15) The title of the disk with the asin attribute value of B004DCAD94 A. B. C. 16) Return the price of all items over A. for $i in //item[price>10] return $i/price B. [price >10.00/price C. for $i in //item/[price>10.00] return $i//price D. //[price >10.00]/value 17) XML schema is used to A. Transform one XML document into another B. Extract data from an XML Document C. Define the structure of an XML database D. Define the structure of an XML document 18) Which of the following is NOT an advantage of using an XML Schema? A. Ensures that the XML is well-formed B. Ensure that an application can read the file C. Inform someone creating a file of the required structure D. Allows a syntax-directed editor to guide the editor 19) XML schema allows for the A. creation of PHP types by restriction B. creation of any type library C. creation of new types by restricting built-in types D. creation of new types by restricting SQL types 20) Which of the following is NOT true of RDF A. RDF is a W3C standard B. RDF is implemented using XML C. RDF it is an extension of RSS D. RDF can be described using RDF Schema (RDFS) Page 4 of 12

5 Section B Answer TWO (2) questions from FOUR (4). All Questions carry the same mark (30) Question 2 Developed in 2000, the Missing Kids site (as used in Coursework 2) is a centralised database of data on missing children around the world. Data must be entered by reporting authorities into an online form. Searches of case details requires the use of an on-line search form. The site might be termed a Web 1.0 information silo because information can only be created and accessed via the site s web interface. A system designed today might look quite different. In Kids 2.0, cases would be exchanged between agencies, cases would searchable and retrievable using an API, cases plotted in time and space to provide visual searching, information on cases submitted by the public using Web 2.0 technologies. a) Explain briefly each of the following technologies and explain, with examples, how and why the technology could be used in this project RSS XML schema API RDF (5 marks each) b) All the above technologies are based on XML. An XML database might also be used for the storage of case details. Discuss the advantages and disadvantages of this approach by comparison with a relational database such as MySQL. (10 marks) Page 5 of 12

6 Question 3 Consider the following logical E-R diagram showing the four entities publisher, book, book_author & author. Primary keys are bolded and underlined and foreign keys have the same name as the parents primary key and are dash undelined. a) Using the E-R diagram above, define the SQL statements for each of the following queries. i) List all the books showing the book title, isbn, cost and published_date ordered by descending published_date. (4 marks) ii) List the book ID, title and subject of all books where the subject includes the word Computing. (4 marks) Page 6 of 12

7 iii) List the isbn and the name of the publisher for the book with the title XQuery: The XML Query Language. (4 marks) iv) List the book title and author surname of any books published before 1 st January (4 marks) v) List the title, publisher name and all authors first name concatenated with last name for any book in the Computing subject area. (4 marks) b) The following table shows four records taken from the book table b_id b_isbn b_title b_subject b_price b_pub_date p_id MySQL & msql XQuery: The XML Query Language Database, Computing, SQL Computing, Programming, Mark Up Languages, XML, XQuery Isaac Newton Science, Physics, History of Science, Biography Introducing Postmodernism Cultural Studies, Philosophy, Postmodernism, Literary Theory i) Define what is meant by the term Candidate Key and using the data sampled above - identify the two candidate keys for this table. (4 marks) ii) Note that above table is not normalized - normalize the table to the 3 rd normal form and illustrate this by drawing a logical E-R diagram showing the book entity and any others entities you create. (6 marks) Page 7 of 12

8 Question 4 Consider the following XML file (products.xml): <?xml version="1.0" encoding="utf-8"?> <products> <product category='helmets'> <productid>707</productid> <name>sport-100 Helemet, Red</name> <productnumber>hl-u509-r</productnumber> <price>24</price> </product> <product category='socks'> <productid>709</productid> <name>mountain Bike Socks, M</name> <productnumber>so-b909-m</productnumber> <price>4.99</price> </product> <product category='socks'> <productid>710</productid> <name>mountain Bike Socks, L</name> <productnumber>so-b909-l</productnumber> <price>4.99</price> </product> <product category='caps'> <productid>712</productid> <name>awc Logo Cap</name> <productnumber>ca-1098</productnumber> <price>5.000</price> </product> </products> PTO Page 8 of 12

9 a) Show the output including all tags and mark-up elements when the following code snippets are run against the above file. i) <xsl:stylesheet version="2.0" xmlns:xsl=" <xsl:template match="/"> <html> <xsl:element name="table"> <xsl:attribute name="border">1</xsl:attribute> <tr><td>product</td><td>price</td></tr> <xsl:apply-templates/> </xsl:element> </html> </xsl:template> <xsl:template match="//product"> <xsl:element name="tr"> <td><xsl:value-of select="name" /></td> <td><xsl:value-of select='format-number(price, "#.00")' /></td> </xsl:element> </xsl:template> </xsl:stylesheet> (5 marks) ii) <xsl:stylesheet version="2.0" xmlns:xsl=" <xsl:template match="/"> <html> <body> <table> <xsl:for-each select="products/product"> <xsl:element name="tr"> <td><xsl:number value="position()" format="1"/></td> <td><xsl:value-of select="name" /></td> </xsl:element> </xsl:for-each> </table> </body> </html> </xsl:template> </xsl:stylesheet> (5 marks) Page 9 of 12

10 iii) <xsl:stylesheet version="2.0" xmlns:xsl=" <xsl:template match="/"> <html> <xsl:element name="table"> <xsl:attribute name="border">1</xsl:attribute> <tr><td>item</td><td>products</td><td>product Ids</td></tr> <xsl:for-each-group select="products/product" <tr> <td><xsl:value-of select="position()"/></td> <td><xsl:value-of <td> <xsl:value-of select="current-group()/productid" separator=", " /> </td> </tr> </xsl:for-each-group> </xsl:element> </html> </xsl:template> </xsl:stylesheet> (5 marks) iv) for $x in doc("products.xml")/products/product return $x/name (2 marks) v) <html> <body> <h1>products</h1> <ul> { for $x in doc("products.xml")/products/product order by $x/name return <li>{data($x/name)}. Category: {data($x/@category)}</li> } </ul> </body> </html> (5 marks) Page 10 of 12

11 b) What are the potential benefits of adopting XML based technologies in a business context? (8 marks) Page 11 of 12

12 Question 5 An application is being developed to assist with choosing the best location for wind turbines in the UK. For this task, data is going to be collected for a full year form weather stations using the WeatherDataOnline software. These stations provide the current observations in the form of a plain text CSV file containing one record of space-delimited values. Amongst these values are data on wind strength, wind direction and max wind gust. The initial implementation has two components. The first is started by an administrator. It fetches the data from each of the stations and stores the wind data in a database. The second allows visitors to select a location on a map, and view the wind data overlaid on the map. a) Outline a typical server-based application to provide this interface, describing the components which would be required, your choice of technology to implement each component and the flow of data between the components. (20 marks) b) Using example from this application, discuss the advantages and disadvantages of: i) CSV and XML for weather data interchange ii) Configuration file or database versus hard-coding for the weather stations (10 marks) Page 12 of 12