Tim; I'm not entirely clear on your scenario. If the below doesn't help then a well-defined example may be necessary to explain what you mean. See some responses inline:
On Mar 30, 7:56 am, Tim Smith <[email protected]> wrote: > Hi, > > I have a need to automatically create the URI for new instances. > > The use case typically involves mashing up a bunch of data from different > sources. Each source typically contains the data necessary to create a URI. > > I use SPARQLMotion to process the data sources either in batch (typically > spreadsheets) or real-time (RSS, webservices). In order to (easily) link > it all together I need to use the same URI for the same thing (owl:sameAs > is nice for inferencing but is miserable in practice). > > There are two ways to do this. I can attempt to look up the new instance > in the current graph (very expensive when you have hundreds of thousands of > new instances coming in...) or I can simply create the same URI for the > same thing across sources. This requires the use of the same "rules" to > create the URI. Currently, I must copy & paste and maintain these rules in > every SM module that needs to create the URIs. If you have hundreds of thousands of new instances coming, then solutions are bound to be expensive. There tends to be an absence of magic wands for big data - some data engineering strategy is usually required. Instead of copy/paste, why not create a SPIN function that is called by the different scripts? > The "rules" are typically an smf:buildURI(......) where the content is > standardized. However, since buildURI does not always create valid URIs > (for example, it will not strip $'s from the input strings) You can use spif:encodeURL() to create valid URIs. > and sometimes > my data sources represent the data for the URI in all caps, or mixed case, > I have to do some formatting and clean up to ensure that the same URI is > created for the same object - I typically use a number of things like > Trim(), replaceAll(), etc... fn:lower-case() works also, and spif:regex() is very flexible. > It would be nice if there was a way to create the URI automatically using a > pre-defined template that is applied when the new instance is created as > part of a CONSTRUCT query. Yes, you could use spin:constructor to run a rule when you create an instance. If the creation is performed in a SM script, then use ApplyConstruct or ApplyTopSpin to execute the rule (which presumably pulls the right data in). > I was thinking that SPIN could do this but I don't know how to make it > create the URI versus just calculating other properties for the instance. I think the piece you're looking for is spin:constructor. You could do a SPARQL Update query in the rule. It would look something like: DELETE { ?this ?p ?o . ?s1 ?p1 ?this . } INSERT { ?uri ?p ?o . ?s1 ?p1 ?uri } WHERE { ?this ?p ?o . ?s1 ?p1 ?this . BIND (spif:buildURI(...) AS ?uri) } > Is this possible? Are there other ways to create standardized URI > templates on a per class basis? Ideally I would like to define the > template on an upper level class (like owl:Thing) and have it automatically > applied to all subclasses while still allowing for per class specialization > of the template that overrides the parent class template just like SWPs use > Instance-Views. SPIN rules do this. The per-class specialization is applied by creating a SPIN rule on that class. This effectively overrides the superclass spin:rule definitions. -- Scott > Thanks in advance for your thoughts, > > Tim -- You received this message because you are subscribed to the Google Group "TopBraid Suite Users", the topics of which include Enterprise Vocabulary Network (EVN), TopBraid Composer, TopBraid Live, TopBraid Ensemble, SPARQLMotion and SPIN. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/topbraid-users?hl=en
