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192 Appendix D. PDL Syntax

IMPORT = import

INSERT = insert

JOIN = join

MAP = map

MODEL = model

OBJECTKEY = object <WS> key

OBJECTTYPE = object <WS> type

OPTION = option

OPTIONS = options

QUERY = query

REFERENCEKEY = reference <WS> key

REMOVE = remove

RETRIEVE = retrieve

RETURNS = returns

SUPER = super

TO = to

TRUE = true

UNIQUE = unique

UNVERSIONED = unversioned

UPDATE = update

VERSIONED = versioned

WS = ([ , \t, \n, \r, \f])+

Punctuation

-----------

SEMI = ;

EQ = =

DOT = .

COMMA = ,

STAR = *

LBRACE = {

RBRACE = }

LBRACKET = [

RBRACKET = ]

LPAREN = (

RPAREN = )

COLON = :

Regular expressions

-------

ID = (<ESC>|<CH>) (<ESC>|<CH>|<DIGIT>)*

CH = [a-z, A-Z, _, $]

ESC = "\\" ~[]

INT = (<DIGIT>)+

DIGIT = [0-9]

STRINGLIT = \" ( ~[\"] | \\\" )* \"

Special Tokens

--------------

COMMENT: // (~[\n, \r])* (\n | \r | \r\n)

• add — used with associations. The PDL ﬁle uses the add keyword, along with an association name,

to signify that a given association should be inserted into the database.

• call — used to signify that a Data Operation contains PL/SQL and should use a

CallableStatement to execute the block of SQL deﬁned in the do block.

• clear — used with associations. The PDL ﬁle uses the clear keyword, along with an association

name, to signify that all associations of the given name should be deleted from the database. This

can be thought of as a "remove all" keyword.

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