If any of the incoming edges of a JoinNode are ObjectFlows, the outgoing edge shall be an ObjectFlow. Otherwise the outgoing edge shall be a ControlFlow.

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AND with ForkNode and JoinNode
Source
Unified Modeling Language 2.5.1
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About Object Management Group copyright in text extracts quoted from OMG specifications for educational purposes
Snippet kind
CONSTRAINT
UML keywords
Activity
Activity Diagram
ControlNode
JoinNode
ActivityNode::outgoing
ActivityNode::incoming
ActivityEdge
A JoinNode is a ControlNode that synchronizes multiple flows. A JoinNode shall have exactly one outgoing ActivityEdge but may have multiple incoming ActivityEdges.
Full quote
If any of the incoming edges of a JoinNode are ObjectFlows, the outgoing edge shall be an ObjectFlow. Otherwise the outgoing edge shall be a ControlFlow.
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Related snippets
A ForkNode is a ControlNode that splits a flow into multiple concurrent flows. A ForkNode shall have exactly one incoming ActivityEdge, though it may have multiple outgoing ActivityEdges.
If the incoming edge is a ControlFlow, then all outgoing edges shall be ControlFlows and, if the incoming edge is an ObjectFlow, then all outgoing edges shall be ObjectFlows.
A JoinNode is a ControlNode that synchronizes multiple flows. A JoinNode shall have exactly one outgoing ActivityEdge but may have multiple incoming ActivityEdges.
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