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Appendix D. PDL Syntax 191

idpath := id ( <DOT> id )*

id := <ID>

integer := <INT>

D.2. PDL Reserved Words

D.2.1. PDL Keywords

The following list, in conjunction with the Section D.2.2 PDL Attribute Types, details all PDL re-

served words. Explanations are provided where applicable. Examples of how to use almost all of

these keywords can be found in the Chapter 9 Persistence Tutorial.

D.2.1.1. Escaping PDL Keywords

Similar to most other languages, the PDL reserved words are not valid except in the context deﬁned for

them unless they are properly escaped. For instance, naming something "composite" or "component"

will cause a compilation error because the parser found a "composite" token instead of an "id" token.

The desire to use keywords as well as legal SQL identiﬁers that would not otherwise be allowed in

PDL (such as ’#’) has prompted the ability to escape special characters and words. In order to use a

reserved word or character in a PDL identiﬁer, it is necessary to precede the character with a ’\’. For

example:

object type StereoReceiver {

...

String[1..1] serial\# = stereo_receiver.serial\#;

String[0..1] \unique = stereo_receiver.unique_column VARCHAR(100);

Component[0..1] \component = join stereo_receiver.component_id

to components.component_id;

...

}

D.2.1.2. Reserved Words

Reserved Words

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

ADAPTER = adapter

ADD = add

AGGRESSIVE = aggressive <WS> load

ALL = all

ASSOCIATION = association

ATTRIBUTES = attributes

CALL = do <WS> call

CLASS = class

CLEAR = clear

COMPONENT = component

COMPOSITE = composite

DATA_OPERATION = data <WS> operation

DELETE = delete

DO = do

EXTENDS = extends

FALSE = false

FOREIGNKEY = foreign <WS> key

IMMEDIATE = immediate

1 2 ... 200 201 202 203 204 205 206 207 208 209 210 ... 229 230

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