.. highlight:: xml .. _aggregation-modelbase-xml: Aggregation model ================= The aggregarion model document defines the aggregation models used. An example of the document contents is given below, for a comprehensive description of all the possible content options see the `schema document `_. Data continuation and abbreviated content expressed as …: The root level tag contains a reference to the schema document which is used to validate the content of the XML document:: An example of aggregation model: the name of the model is `sum`, that will be used to refer to this model in model chains. `simoaggr.py` contains the implementation of the model. `` is xs:bool value indicating whether the aggregation model can handle vectors, i.e. multiple target attributes simultaneously:: … sum Sums up either values of two operands or values of a single operand (a list of values) simoaggr.py false