Revision as of 14:21, 25 September 2023

?? LINKS TO ALL interesting pages ??

The Dependency Graph

At the lowest level the graph is structured by linking learning contents to its prerequisite(s) and useful resources. A student can now use these links to determine how items depend on each other, and what knowledge is required to understand a specific item.

In the end the graph turns into a big interconnected structure:

In order to make this amount of data useable, several Structure-Items have been defined to help group items into abstract categories.

For a more detailed explanation of the entire underlying structure go to GraphStructure or take a quick look at these following diagrams:

The base structure
Connection of courses
Dependencies and use

Using the Graph

The graph itself is more a database, than a tool. In order to make it usable several ideas have been devised and implemented. Here's a quick example of what is possible on site.

Timeline of Course Sessions

Overview of Student

Shows what items a Student is has linked their item to. Can be used to track progress.

Learning path

The complete path to an item (here: Virtual Cameras) and what's next.

NOTE: Color coding was currently not possible for this specific case.

Course Work

What items are used in a mandatory coursework:

The learning path to wd:Q451

@@ Line 33: / Line 33: @@
 The graph itself is more a database, than a tool. In order to make it usable several ideas have been devised and implemented. Here's a quick example of what is possible on site.
+== Timeline of Course Sessions ==
+{{#widget:SPARQLquery|code=
+#defaultView:Timeline
+PREFIX wdt: <https://graphit.ur.de/prop/direct/>
+PREFIX wd: <https://graphit.ur.de/entity/>
+select distinct ?item ?itemLabel ?date ?image #?dependency ?dependencyLabel
+where {
+  ?session wdt:P14 ?item.
+  MINUS {?item wdt:P20 ?url.}
+  MINUS {?session wdt:P3 wd:Q162.}
+  # OPTIONAL {?item wdt:P1 ?dependency.}
+  OPTIONAL {?item wdt:P11 ?image.}
+  ?session wdt:P19 ?date.
+  service wikibase:label { bd:serviceParam wikibase:language "en".}
+}
+}}
-'''TODO: Use Example Student to explain use of graph'''
+== Overview of Student ==
+Shows what items a Student is has linked their item to. Can be used to track progress.
+{{#widget:SPARQLquery|code=
+#defaultView:Graph
+PREFIX wdt: <https://graphit.ur.de/prop/direct/>
+PREFIX wd: <https://graphit.ur.de/entity/>
+SELECT ?item1 ?image ?item1Label ?item2 ?image2 ?item2Label ?edgeLabel ?rgb WHERE {
+  VALUES ?item1 {wd:Q157}
+  ?item1 ?prop ?item2.
+  ?edge ?dummy ?prop ; rdf:type wikibase:Property.
+  # Color Coding:
+    bind (if(?prop = wdt:P25, "e8fcff", # participates in (blue)  f3fdff
+          if(?prop = wdt:P12, "e3ffd9", # has completed (green)
+          if(?prop = wdt:P23, "ffeec2", # interested in (orange)
+       "FFFFFF" ))) as ?rgb).
+SERVICE wikibase:label { bd:serviceParam wikibase:language "[AUTO_LANGUAGE],en". }
+} ORDER BY ?prop
+}}
+== Learning path ==
+The complete path to an item (here: [[Item:Q149|Virtual Cameras]]) and what's next.
+{{#widget:SPARQLquery|code=
+#defaultView:Graph
+# prerequisite -> topic -> postrequisite
+PREFIX wd: <https://graphit.ur.de/entity/>
+PREFIX wdt: <https://graphit.ur.de/prop/direct/>
+#SELECT distinct ?topic ?topicLabel ?pre ?preLabel ?post ?postLabel  ?level ?rgb
+SELECT ?topic ?topicLabel ?pre ?preLabel ?post ?postLabel ?rgb
+WHERE {
+{
+  { SELECT * WHERE {
+  { SELECT ?goal ?goalLabel ?topic ?topicLabel ?rgb WHERE {
+    {
+    BIND (wd:Q149 as ?goal).
+    ?goal wdt:P1+ ?topic.
+    } UNION {
+      VALUES ?topic { wd:Q149 } # we also want to include the root node itself
+    }
+  }
+  }
+  ?topic wdt:P1 ?pre.
+  }
+  }
+  Union
+  { SELECT * WHERE {
+  { SELECT ?topic ?topicLabel ?goal ?goalLabel ?rgb WHERE {
+    {
+      BIND (wd:Q149 as ?topic).
+      ?goal wdt:P1+ ?topic.
+    }
+  }
+  }
+  ?post wdt:P1 ?topic.
+  }
+  }
+  # CC (only works in Table not GraphView)
+  #bind (if(bound(?post), "FAB86C",
+           #if(?topic = wd:Q149, "FDD3A2", "FFEDD8")) as ?rgb).
+  SERVICE wikibase:label { bd:serviceParam wikibase:language "[AUTO_LANGUAGE],en". }
+}
+}
+}}
+NOTE: Color coding was currently not possible for this specific case.
+== Course Work ==
+What items are used in a mandatory coursework:
+{{Learnpath|quiz=wd:Q451}}

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