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Assignment 3

Assignment 3a - Extraction

• Yield at least 30 rows 
• Involve at least 3 tables (each query has to involve at least 3 tables) 
• Return at least 7 result columns (each query has to return at least 7 result columns) 

• No query is allowed to use the same 3 tables 
• Two queries have to use the XML columns 
• The results have to be formatted in proper «XML» 
• Use xmlelement, xmlagg and xmlforest (all three mandatory) within each query or overall?  
• Each XML result has to contain at least 5 levels of elements (including root element) and at least 3 different attributes. E.g.: 

Submission

• 1 file dump.db - created with pg_dump command line tool than can be imported with pg_restore. 
• 1 file doc.pdf which contains the (revised) data model picture. 
• 1 file code.pdf which contains each query (SQL and SQLXML), for each SQL query the 19 first lines of the result as a table. 
• 1 file code.zip including the xmls resultX.xml, where X is the number from 1 to 4. 

Hints

• If the filenames are not correct, you will get no points. 
• If your dump can not be imported with pg_restore (TEST IT!), you will get no points. 
• If your model/db does no longer conform to the rules in assignment 2, you will get no points. 
• If you violate any rules you will get no points. 

Assignment 3b - Schema

• All schemas have to be different (through more than whitespace). 
• Use grammar, start for each schema 
• Use at least 4 <define>'s in each schema 
• Use at least (zeroOrMore OR oneOrMore), interleave, choice (for values), choice (for elements or attributes), optional and list. 

Submission

• 1 file dump.db - created with pg_dump command line tool than can be imported with pg_restore. 
• 1 file doc.pdf which contains the (revised) data model picture. 
• 1 file code.pdf which contains each query, for each query the 19 first lines of the result as a table. 
• 1 file code.zip which 4 files resultX.xml, and 4 files resultX.rng. X is number from 1 to 4 (or higher if you have more than 5 queries). 

Hints

• If the filenames are not correct, you will get no points. 
• If your dump can not be imported with pg_restore (TEST IT!), you will get no points. 
• If your model/db does no longer conform to the rules in assignment 2, you will get no points. 
• If you violate any rules you will get no points. 

Assignment 3c - Queries

• At least 5 queries have to return nodes while considering information from descendants that are not children of these nodes to do so. 
• At least 5 queries have to consider information that is stored in attributes. 
• At least 5 queries have to use aggregate functions. 
• At least 5 queries have to deal with text and text related functions. 
• At least 5 queries have to return nodes while considering information from ancestors of these nodes to do so. 
• At least 2 queries have to union result sets. 
• At least 1 query has to find the maximum or minimum of something (beware, the maximum aggregate function is not part of XPATH 1.0)  

Submission

• 1 file dump.db - created with pg_dump command line tool than can be imported with pg_restore. 
• 1 file doc.pdf which contains the (revised) data model picture. 
• 1 file code.pdf which contains each query, for each query the 19 first lines of the result as a table, and for each query an extract of the XML result not longer than 1 page. 
• 1 file code.zip which 4 files resultX.xml, and 4 files resultX.rng. X is number from 1 to 4 (or higher if you have more than 5 queries). 
• 1 file queries.zip with 19 files queryXx.txt which contains just the XPath queries, and 19 files resultXx.txt that describe what your query is supposed to do. 
  • The big X denotes the resultX.xml that the query is to be applied on. 
  • The small x is a counter from 1 to 6. 

Hints

• If the filenames are not correct, you will get no points. 
• If your dump can not be imported with pg_restore (TEST IT!), you will get no points. 
• If your model/db does no longer conform to the rules in assignment 2, you will get no points. 
• If you violate any rules you will get no points.