# Overlapping Wildcards and Disjoint Properties

Some destination properties are disjoint, and the server allows that property to be set only once for each destination. If an existing destination includes a value for a disjoint property and you attempt to assign a different value, the action will fail.

Overlapping wildcard destinations can cause conflicts with disjoint properties. For example, consider the following configuration of the store property:

    topic.sample.>        store=$sys.failsafe
    topic.sample.quotes.* store=$sys.nonfailsafe

The topic `topic.sample.quotes.tibx` would be assigned both stores, `$sys.failsafe` and `$sys.nonfailsafe`. Therefore, the wildcard topics `topic.sample.>` and `topic.sample.quotes.*` cannot coexist. Their creation would fail.

EMS currently has only one disjoint property: `store`.

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