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In the context of a database system operating in a client/server model, the database server is responsible for processing the queries presented by the client and returning the results accordingly. This has been termed query shipping, where the query is shipped to the server and a payload (data) is returned. The benefits of query shipping are a reduction of communication time for queries and the ability to exploit server resources rather than using the more limited resources of the client to conduct the query. This model also permits a separation of how the data is stored and retrieved on the server from the way the data is used on the client. In other words, the client/server model supports data independence. Data independence is one of the principal advantages of the relational model introduced by Codd in 1970: the separation of the physical implementation from the logical model. According to Codd,8 Users of large data banks must be protected from having to know how the data is organized in the machine Activities of users at terminals and most application programs should remain unaffected when the internal representation of data is changed. This separation allows a powerful set of logical semantics to be developed, independent of a particular physical implementation. The goal of data independence (called physical data independence by Elmasri and Navathe9), is that each of the logical elements is independent of all of the physical elements (see Table 2-1). For example, the logical layout of the data into relations

As mentioned in the example, recursive-descent parsers are LL(n) parsers; in other words, they perform leftmost derivation. Typically, only a single look-ahead symbol is used to drive parsing these are LL(1) parsers but the example can be extended to LL(n) for some n>1, because inside a given parsing function you can retrieve several look-ahead symbols and make the appropriate parsing decisions. This is possible because the look-ahead calculation is nondestructive; in other words, there is no global parsing state. Instead, you pass around the particular input string (the remaining token stream) instance on which you want to base your parsing. LR parsers are a special subset of bottom-up parsers; they read their input from left to right and produce a rightmost derivation (that is, the rightmost nonterminal is always expanded during parsing). Special subsets include Simple LR (SLR) and Look-Ahead LR (LALR; as generated by the yacc family of parser generators, including fsyacc, as you see in the coming sections); and extensions include LR(1), (where the parse tables are typically larger because of the one symbol look-ahead) and Generalized LR (GLR), which can handle nondeterminism and ambiguous grammars.

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system calls requires that the calling convention adopted by the operating system is implemented, and it is often used to interact with different runtimes Another popular approach is to support the calling convention adopted by C compilers because it is widely used and has become a fairly universal language for interoperability Note that although many operating systems are implemented in C, the libraries providing system calls may adopt different calling conventions This is the case of Microsoft Windows where the operating system adopts the so-called stdcall calling convention rather than the C calling convention A significant dimension in the arena of possible calling conventions is the responsibility for removing the activation record from the thread stack At first glance, it may seem obvious that it is the called function that before returning resets the stack pointer to the previous state.

8. C. J. Date, The Database Relational Model: A Retrospective Review and Analysis (Reading, MA: Addison-Wesley, 2001). 9. R. Elmasri and S. B. Navathe, Fundamentals of Database Systems, 4th ed. (Boston: Addison-Wesley, 2003).

There are various limitations that you can t handle with recursive-descent parsers For instance, if you translate a left-recursive production into code, you get an infinite recursion, like so: <polynomial> ::= <polynomial> '+' <term> | <term> This corresponds to the following: let rec parsePolynomial src = let poly, src = parsePolynomial src .. Another common problem with LL(k) parsing for some k>=1 is that the grammar rules for a given nonterminal can t start with the same symbols, or else there is no easy way to decide which rule to apply (because each is determined to be applicable upon checking k number of symbols) In such cases, leftfactoring can be applied.

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