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SYNTAX:
 
xpxTestAttrBN (instanceId    : GENERIC;
               attributeName : STRING;               VAR isSet     : BOOLEAN)
               status        : INTEGER;
 
The xpxTestAttrBN function returns TRUE in the isSet argument if the specified attribute attributeName in the specified instance instanceId has a value, else the isSet argument is set to FALSE. An attribute is assigned a value by a put function like xpxPutAttr, xpxPutAttrs etc.
This function is equivalent to the EDMinterface function sdaiTestAttrBN
See also xpfTestAttrBN.

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