Changes between Version 15 and Version 16 of CurrentlyProposedLanguage

Timestamp:

Nov 5, 2010 4:31:48 PM (13 years ago)

Author:

sunshine

Comment:

--

CurrentlyProposedLanguage

@@ -86 +86 @@
 
 We should have a notion of events matching each other, like a reply matches a request. To support this there's a function '''match(event1, event2)''' which is defined in the domain knowledge base for each request/reply pair. In the timeline of events part of a meta-description if we want a reply to match a request we must explicitly say so using '''such that''' operator or have a condition on reply matching the request to proceed with the rest of the events in the sequence.
+
+= Meta-descriptions =
+
+A meta-description starts with 
+
+'''define MDName:'''
+
+and may be followed by import statements if it uses/extends some other metadescriptions, such as
+
+'''define MDName: import MD1 m1, MD2 m2'''
+
+It has the following sections
+
+'''Logical topology'''
+
+   '''Objects'''
+   
+    All relevant objects are defined here. If some are imported from other meta-descriptions and use the same name, are of the same type and have the same initialization they are not mentioned. If some are imported but the name/type/initialization are changed they are mentioned here, linked to the object they extend from the imported meta-description and any changes are noted. For example:
+
+    Name := m1.name, Name := {String n, state = Assigned}
+
+   '''Relationships'''
+  
+   Relationships between objects are defined here. For now we use only '''collocated''' function.
+
+'''Timeline of events'''
+
+   '''Definitions'''
+
+   This section defines all events and states. We may use '''each''', '''some''' operators and aliases for state definitions. Event types may extend other event types. All events/states must be defined here. If we inherit some events from other meta-descriptions and customize inherited ones, we have to redefine them. In case of inheritance relevant events will be checked against both meta-descriptions. If we inherit events from other meta-descriptions as they are, without customizations, we can just note that without redefining them. For example if we imported from m1 that had defined event e2 as event of type INFO without any parameters we'd do the following in order to customize it:
+
+   e1 := m1.e2, e1 := {type = INFO, content = x}
+
+   vs doing the following if we're not customizing:
+  
+   e1 := m1.e2
+
+
+   If we are importing all events from a metadescription we don't have to say anything in this section.
+
+
+
+   '''Timeline'''
+
+   This section describes ordering of events, i.e. the scenario of the experiment. In case of inheritance, the inherited scenario should be possible to obtain from the given one. If we are combining two or more meta-descriptions we can either interleave their events manually such as
+
+    m1.e1 -> m2.e1 -> m2.e2 -> m1.e3
+
+  or we can say that all events from one meta-description occur in some given order with events from other meta-description, such as
+
+  timeline(m1) -> timeline(m2)
+
+  The above means that all events from m1 must happen before any events from m2.