Difference between revisions of "Template:Edge"
(another attempt to fix the issue) |
(hopefully this fixes it, seems to be the standard way to pass optional parameters safely) |
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| Line 53: | Line 53: | ||
First, generate the necessary table: | First, generate the necessary table: | ||
| − | Notes: the | + | Notes: the hardest piece of this is that the Metaclass template is very sensitive to its variables being defined; the fix used here is supplying a different named variable if the variable we're interested in is undefined; i.e. we pass our "extends" variable to "extends" if it's present, but if it's not present, we pass it to a variable "extendsNULL" instead, so that the variable "extends" is never defined. |
| − | --></noinclude>{{Metaclass {{#if:{{{extends|}}}| | + | --></noinclude>{{Metaclass |
| − | | description = {{{description | + | | extends{{#if:{{{extends|}}}||NULL}}={{{extends}}} |
| + | | description = {{{description}}} | ||
| + | | references{{#if:{{{references|}}}||NULL}}={{{references}}} | ||
}} | }} | ||
Revision as of 18:43, 24 March 2014
This template, for use on edge kind pages, takes in a short description of this edge, and a list of the kinds of connections this edge can form (the predecessor node kind, successor node kind, and multiplicities at each end), and stores that information in properties so it can be retrieved by knowing either the edge kind, the predecessor kind, or the successor kind, using a single query.
It also produces a table summarizing this information.
For example, this is the template call that would be used on a page "Edge" to indicate that "Edge" is an edge kind, that connects either a "Foo" node kind to a "Bar" node kind, or to a "Baz" node kind, with each "Bar" node being associated with exactly one "Foo" node, and each "Baz" node optionally being associated with exactly one "Foo" node:
{{Edge | extends = Another Type of Edge, Yet Another Type of Edge | description = Connects a Foo to a Bar or a Baz | references = ... | connects = Foo,Bar,1,*;Foo,Baz,0..1,* }}
As with the Metaclass template, the extends and references parameters are optional.
The visible output of this will be a metaclass table describing the edge, plus a table summarizing the connections:
| Metaclass | Edge |
|---|---|
| Extends | , Another Type of Edge, Yet Another Type of Edge |
| Description | Connects a Foo to a Bar or a Baz |
| References | ... |
| Predecessor | Multiplicity | Successor |
|---|---|---|
| Foo | 1 ➞ ✱ | Bar |
| Foo | 0..1 ➞ ✱ | Baz |
In addition, the following properties will be created:
edge from [predecessor]::[successor],[multiplicity],[description of this edge]
edge to [successor]::[predecessor],[multiplicity],[description of this edge]
For the above example, the properies will be:
edge from Foo::Bar,*,Connects a Foo to a Bar or a Baz
edge to Bar::Foo,1,Connects a Foo to a Bar or a Baz
edge from Foo::Baz,*,Connects a Foo to a Bar or a Baz
edge to Baz::Foo,0..1,Connects a Foo to a Bar or a Baz
| Metaclass | Edge |
|---|---|
| Description | {{{description}}} |
| Predecessor | Multiplicity | Successor |
|---|---|---|
| Node Kind | 1 ➞ ✱ | Node Kind |
| Node Kind | ✱ ➞ 1 | Node Kind |
