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| 1 | Type | Name | Comment |
| 2 | GENERIC | modelId | A numeric modelID that uniquely identifies the data model of interest in the EDMdatabase . |
| 3 | STRING | entityName | Specifies the name of the entity that defines the actual instance type to query. Entity names are case insensitive. |
| 4 | STRING | condition | Specifies the condition the target instances should match. All instances in the specified aggregate match an empty condition, i.e., <condition> = NULL. All legal symbolic Express-X logical expressions are a legal <condition> value. This <condition> argument will be compiled by the EDMexpressXCompiler |
| 5 | INTEGER | options | see below. The <options> value can be specified as a bitwise OR between the actual options to enable. |
| 6 | INTEGER | firstIndex | All the instances of entities are kept in entity extents. All the entity extents of the entities that are to be queried (subtypes may also be queried) are joined into a single aggregate of instances. The position in this aggregate to start reading from is specified by this parameter. This way, huge populations may be incrementally queried by setting this argument equal to one more than the value of <indexOfLastFound> that resulted from the previous iterative call to this function. |
| 7 | INTEGER | maxHits | The greatest allowed number of hits in the query result. When this number of matching instances is found, the search for additional matches will stop. |
| 8 | INTEGER | indexOfLastFound | The index of the "last returned matching element". This argument enables the caller to search for instances in an incremental way by specifying this returned "index value plus one" as the input to the next xpxSelectAggrInstancesEx function and so on. |
| 9 | INTEGER | actualHits | The number of matching instances found. If this value is equal to the <maxHits> argument, it is a possibility that there may be more matching instances among the queried entity types. |
| 10 | SET OF GENERIC | foundInstances |
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