Queries LDBC
In addition, the classes Forum, Message, Organisation, Person, Place, Tag, and TagClass are subclasses of a class named "IdentifiedElement", which has no incoming or outgoing references and a single attribute of type ELong named "ID". This superclass has been omitted from the figure for readability reasons.
NAC1 represents a negated existential nested graph condition, the pattern of which comprises the nodes i1 and o1 (shared with the base pattern via partial morphism) as well as the edge in between (exclusive to the condition's pattern). NAC2 similarly represents a negated existential nested graph condition, the pattern of which comprises the nodes i1 and o2 (shared with the base pattern via partial morphism) as well as the edge in between (exclusive to the condition's pattern). NAC1 and NAC2 are connected via conjunction.
NAC represents a negated existential nested graph condition, the pattern of which comprises the nodes p1, m, and t (shared with the base pattern via partial morphism), the nodes k2, p3, and m2 (exclusive to the condition's pattern), as well as the edges in between (exclusive to the condition's pattern).
NAC1 represents a negated existential nested graph condition, the pattern of which comprises the nodes p1, m, and t (shared with the base pattern via partial morphism), the nodes k2, p3, and m2 (exclusive to the condition's pattern), as well as the edges in between (exclusive to the condition's pattern). NAC2 represents a negated existential nested graph condition, the pattern of which comprises the node m (shared with the base pattern via partial morphism) and the node c (exclusive to the condition's pattern), as well as the edge in between (exclusive to the condition's pattern). NAC1 and NAC2 are connected via conjunction. NAC1.1 represents a negated existential nested graph condition nested into the condition for NAC1, the pattern of which comprises the node m2 (shared with the pattern of NAC1 via partial morphism), the node c2 (exclusive to the pattern of NAC1.1), as well as the edge in between (exclusive to the pattern of NAC1.1).