hasEdgeTo abstract method
Determine if there is such a valued directed link
(Optional) Only if it matches any of anyTags
and matches all items in allTags
Implementation
bool hasEdgeTo(from, to, key, {List anyTags, List allTags});
Determine if there is such a valued directed link
(Optional) Only if it matches any of anyTags
and matches all items in allTags
bool hasEdgeTo(from, to, key, {List anyTags, List allTags});