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SYNTAX:
 
xpfTestAttr (instanceId , attrId : GENERIC)
             attrValueIsSet      : BOOLEAN;
 
The xpfTestAttr function returns TRUE in the argument <attrValueIsSet> if the specified attribute <attrId> in the specified instance <instanceId> has a value, else the function returns FALSE. An attribute is assigned a value by a put function like xpxPutAttr, xpxPutAttrs etc.
This function is equivalent to the EDMinterface function sdaiTestAttr.
See also xpxTestAttr and xpfTestAttrBN.

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