The spider graph is formed by linking the three intersections of each variable with the facets, forming a triangle for each variable.
通过在平面中连接每个变量的三个交点可形成辐射图形,这样每个变量形成一个三角形。
2
In this example, the first triple in the WHERE clause's graph pattern matches a node with a foaf: name property of "Jon Foobar," and binds it to the variable named contributor.