Thanks a lot David for the clarification. I'll proceed to either
flatten my tree, or alternatively create simpler data structures
which may be a simpler solution given what I want to use Exhibit for.
Gudmundur (Mummi)
On 22 Oct 2007, at 09:34, David Huynh wrote:
> Guðmundur,
>
> There are 3 things that can potentially get nested / hierarchical /
> deep:
>
> 1. The (abstract) data model: the Exhibit data model is a graph data
> model. Thus it can also describe trees (read, hierarchical).
>
> 2. The syntax in which the data model is serialized: the Exhibit JSON
> syntax is NOT hierarchical. It is flat (read, list of items). In order
> to describe a graph model in the Exhibit JSON syntax, you link the
> items
> by their IDs. For example,
>
> { label: "Homer Simpson",
> fatherOf: [ "Lisa Simpson", "Bart Simpson", "Maggie Simpson" ],
> marriedTo: "Marge Simpson"
> },
> { label: "Bart Simpson",
> age: 9,
> sonOf: [ "Homer Simpson", "Marge Simpson" ],
> brotherOf: [ "Lisa Simpson", "Maggie Simpson" ]
> }
>
> (An item's ID is the same as its label if no "id" property is
> explicitly
> given.) You can see that this lets us model quite a complex graph. If
> you want to model a tree, then think of it as a graph, and flatten it
> into a list of interlinking items.
>
> 3. The renditions of the data: Exhibit lens templates are not
> automatically nested, but you can explicitly specify hierarchical lens
> templates.
>
> Hope that helps,
>
> David
>
>
> Guðmundur Árni Þórisson wrote:
>> Hi all. Sorry for my apparent ignorance, but I've just started using
>> Exhibit and don't quite know all the nuances involved. Basically, I
>> think I can make great use of the Exhibit/JSON combination with very
>> little effort, IF it can accommodate my existing nested-relations
>> data structures).
>> One restriction for me seems to be the property=>value in the JSON
>> structure and the way it is used in Exhibit expressions. I want to
>> ask the following: is there a way to get to the intervals of a
>> property-value which is actually a hash, not a simple value? Here''s
>> the HTML I am trying to get working, see a sample data structure
>> below.
>>
>> <div ex:role="view"
>> ex:viewClass="TabularView"
>>
>> ex:columns=".Study.Title, .LocalID, .ParentSamplepanelID.LocalID, .To
>> tal
>> NumberOfIndividuals, .GeographicRegionInfo"
>> ex:columnLabels="Study, Panel name, Parent panel, No.
>> Individuals, Geographic region"
>> ex:columnFormats="text, text, text, text, number, text"
>> ex:sortColumn="1"
>> ex:sortAscending="false">
>> </div>
>>
>> I am essentially trying to access the 'Title' attribute of the
>> 'Study' item-of-sorts which is a hash embedded in the 'Samplepanel'
>> main item. When I do the above I get nothing in the first field of my
>> table. If I use just the '.Study' expression I get the 'Object
>> object' string which is presumably some generic stringified version
>> of the Study data structure?
>>
>> I guess my question boils down to this: can Exhibit JSON data
>> structures for items be deeper than just simple property/value pairs
>> or not?
>>
>>
>> Best regards,
>>
>> Mummi, Leicester
>>
>>
>> {
>> "types" : {
>> "Samplepanel" : {
>> "pluralLabel" : "Samplepanels"
>> }
>> },
>> "properties" : {
>> "Study" : {valueType : "item"}
>> },
>> "items" : [
>> {
>> "type" : "Samplepanel",
>> "label" : "PLCO_cohort",
>> "GeographicRegionInfo" : "NORTH AMERICA",
>> "id" : "1818",
>> "SamplingAgeRange" : "55-74",
>> "Composition" : "",
>> "LocalID" : "PLCO_cohort",
>> "TotalNumberOfIndividuals" : "155000",
>> "EthnicityInfo" : "White, non-Hispanic",
>> "DNAsArePooled" : "Undefined",
>> "NumberOfSexFemale" : "0",
>> "SamplepanelID" : "1818",
>> "NumberOfSexMale" : "0",
>> "Study" : {
>> "SubmissionDate" : "2007-03-15",
>> "StudyID" : "HGVST00003",
>> "Title" : "NCI CGEMS study of Prostate Cancer, Phase 1A"
>> },
>> "DNAsAreWGA" : "Undefined"
>> },
>>
>>
>> -----------------------------------------------------------
>> Gudmundur A. Thorisson, PhD student, Brookes lab
>> Department of Genetics
>> University of Leicester
>> University Road
>> Leicester, LE1 7RH, UK
>> E-mail: [EMAIL PROTECTED]
>> Tel: +44 (0)116 252-3055
>>
>>
>>
>>
>> _______________________________________________
>> General mailing list
>> [email protected]
>> http://simile.mit.edu/mailman/listinfo/general
>>
>
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