1. A computer-implemented method, comprising: receiving a selection of a particular logical field via a database query interface; querying a discovery registry associated with a data abstraction model of a database to discover one or more web services that are resolvable based on the particular logical field, wherein the data abstraction model includes a plurality of logical fields, wherein each logical field of the plurality of logical fields corresponds to a particular data structure of the database, wherein a web service input of a particular discovered web service is associated with a first logical field of the data abstraction model via the discovery registry, and wherein a web service output of the particular discovered web service is associated with a second logical field of the data abstraction model via the discovery registry; initiating execution of a first discovered web service of the one or more discovered web services, wherein a first list of values is returned upon execution of the first discovered web service; and augmenting the first list of values from the first discovered web service with information determined based on field relationship metadata of the data abstraction model, wherein the field relationship metadata corresponds to the first list of values, wherein the first list of values is augmented by one or more field “IS A” relationships that are identified via the data abstraction model and used for term expansion, and wherein when an identified “IS A” relationship is such that an output of the first discovered web service is a superclass, the first list of values are filtered to be only those values that are in a desired subclass.