Predicate property

From Prologstandard

Current revision as of 17:39, 17 May 2007

[edit] built-in

[edit] Existing standard

8 Built-in predicates:

• A built-in predicate is a procedure which is provided automatically by a *standard-conforming processor, (page 63).

5.5.9 Built-in predicates:

• A processor may support one or more additional built-in predicates (8) as an implementation specific feature.

7.5 (Database):

• Built-in predicates and control constructs are provided by the processor. They have properties which are defined by the clauses in this part of ISO/IEC 13211.

[edit] Future

Options:

• standardise
• don't standardise

Meanings:

• cannot be abolished

[edit] extended/foreign

A new predicate property to identify code written in an external language:

Options:

• predicate properties only for the core standard
• predicate properties related to extensions outside the core standard

Naming:

• extended
• foreign
• both

[edit] standard/standard(Version)

built-ins defined by the standard of version

Options:

• add to standard
• don't add to standard

[edit] listable

clause/2 can access the predicate.

[edit] definition_available/source_available

clause/[2,3] can be called on this predicate

Options:

• add to standard
• don't add to standard

Naming:

• definition_available
• source_available