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, .Total
> 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
>
>
>
>
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> [email protected]
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>
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