2010/4/8 Niels Hoogeveen <pd_aficion...@hotmail.com>
>
> Your point about the cardinality restriction is a correct observation.
>
> In fact it would be better to create a "is-subdivision-of" PropertyType on
> "sub-division" and give that a range "country" with a cardinality of 1. Then
> for each subclass of "sub-division" a restriction should be set, naming the
> "country" class this specific "sub-division" class applies to.
>
> Still, it requires each country to be defined as both a class and an
> instance.
>
Why just countries as classes? why not each subdivision as classes as well?
Why countries as classes at all?
>
> > Date: Thu, 8 Apr 2010 19:15:30 +0200
> > From: matt...@neotechnology.com
> > To: user@lists.neo4j.org
> > Subject: Re: [Neo] meta meta classes
> >
> > So, you describe the model (with "country", "sub-division" and
> > "has-sub-division") which is OK! Then you not just want to add data which
> > would conform to it, you also describe the highest level of that data in
> the
> > meta model itself with cardinality for how many sub-divisions each such
> > level must contain.
> >
> > My first though here is: why put actual data into the meta model (the
> design
> > isn't intended for that)?
> > The second is: why (since you put actual data into the meta model) would
> you
> > stop there? why only say that "France" have 10 subdivisions? You don't
> say
> > exactly which subdivisions or how many/which subdivisions each
> subdivision
> > has, a.s.o. Which benefits would modeling only the highest level of data
> get
> > you? And if you could describe the entire data in the meta model, you end
> up
> > with a meta model which describes the entire data and then, in addition,
> the
> > data which is exactly the same as the meta model... what benefits does
> that
> > give you?
> >
> > I'm just confused about the fact that you want to have the meta model
> > (classes, properties, restrictions) and (some of) the actual data modeled
> in
> > the meta model, whereas the meta model was intended to model the meta
> model
> > (the UML diagram, so to speak) and not the actual data it would have
> conform
> > to it.
> >
> > Help me understand which benefits you're after by modeling the "top
> level"
> > of your actual data into the meta model itself.
> >
> >
> > Best,
> > Mattias
> >
> > 2010/4/8 Niels Hoogeveen <pd_aficion...@hotmail.com>
> >
> > >
> > > The example of the tag library and countries/sub-divisions are not
> > > necessarily similar. The first shows the need to model the properties
> of a
> > > class.
> > >
> > > The second example shows the need to have singleton classes, which is a
> > > different concept, and something that cannot be done out of the box,
> but I
> > > will show a solution that requires minimal modifications to the current
> > > software.
> > >
> > > Suppose we want to model "countries" and their "sub-divisions".
> > >
> > > We do the following:
> > >
> > > create class "country"
> > > create class "sub-division"
> > > create property "has-sub-division"
> > > make "has-subdivision" a property of "country"
> > >
> > > Now we like to populate the database, since all countries have
> different
> > > types of sub-divisions we need to create those:
> > >
> > > create class "french_region"
> > > create class "canadian_province"
> > > create class "canadian_territory"
> > > create class "US_state"
> > > etc.
> > >
> > > Populate the various classes with instances:
> > >
> > > create node for "Alsace" and make it an instance of "french_region"
> > > create node for "Aquitaine" and make it an instance of
> > > "french_region"
> > > create node for "Alberta" and make it an instance of
> > > "Canadian_province"
> > > create node for "Nanavut" and make it an instance of
> > > "Canadian_territory"
> > > create node for "British Columbia" and make it an instance of
> > > "Canadian_province"
> > > create node for "Alabama" and make it an instance of
> > > "US_State"
> > > create node for "Alaska" and make it an instance of
> > > "US_State"
> > > etc.
> > >
> > > We'd like to state that each country has its own restriction on the
> type of
> > > subdivision. To do that we need to create classes for each country.
> > >
> > > create class "France"
> > > create class "Canada"
> > > create class "United_States_of_America"
> > > etc.
> > >
> > > make class "France" a subclass of "Country"
> > > make class "Canada" a subclass of "Country"
> > > make class "United_States_of_America" a subclass of "Country"
> > > etc.
> > >
> > > create restriction for "France" on "has-sub-division" with range
> > > "french_province" and cardinality = 26
> > > create restriction for "Canada" on "has-sub-division" with range
> > > "canadian_province" and cardinality = 10
> > > create restriction for "Canada" on "has-sub-division" with range
> > > "canadian_territory" and cardinality = 3
> > > create restriction for "United_States_of_America" on "has-sub-division"
> > > with range "US_State" and cardinality = 50
> > > etc.
> > >
> > > Now we have classes for each country, but no instances. Unfortunately
> we
> > > cannot say that a class is an instance of itself, that would require a
> > > relationsship where the endnode equals the startnode, which Neo4J
> doesn't
> > > allow. So we have to create separate instances for each country.
> > >
> > > create node for "France"
> > > create node for "Canada"
> > > create node for "United_States_Of_America"
> > > etc.
> > >
> > > make node "France" an instance of class "France"
> > > make node "Canada" an instance of class "Canada"
> > > make node "United_States_of_America" an instance of class
> > > "United_States_of_America"
> > >
> > > And finally link the subdivisions to their countries:
> > >
> > > "France" "has-sub-division" "Alsace"
> > > "France" "has-sub-division" "Aquitaine"
> > > "Canada" "has-sub-division-of" "Alberta"
> > > "Canada" "has-subdivision" "British Columbia"
> > > "Canada" "has-subdivision" "Nanavut"
> > > "United_States_of_America" "has-sub-division" "Alabama"
> > > "United_States_of_America" "has-sub-division" "Alaska"
> > >
> > > So we end up having a class for each country and an instance for each
> > > country.
> > >
> > > Writing this down, I realize the patch I sent you a few days ago,
> contains
> > > a minor flaw, that needs to be fixed. In that patch I added an indexed
> > > property "uri" to the meta model, to bring it in line with what is
> being
> > > done in the RDF module, and to make certain that the same URI is not
> used
> > > for two different properties. Without unicity a class can have several
> > > different ProperyTypes with the same name. In that situation the lookup
> of
> > > the PropertyType of a property or relationship becomes impossible.
> > >
> > > The flaw in my patch is the name of the "uri" property, which should be
> > > something like "class_uri". That way the class of each country can be
> given
> > > the same URI as the instance of each country, because they live in
> different
> > > name spaces.
> > >
> > > This same technique is used in OWL to provide "punning". An instance
> and a
> > > class can have the same URI, because instances in OWL live in a
> different
> > > namespaces from classes.
> > >
> > > Through the use of the "uri" property and the "class_uri" property we
> can
> > > also distill that each country class is a singleton class, because
> there
> > > exists an instance with the same URI. That way we can work around the
> > > limitation that relationships cannot have the same start and end node.
> > >
> > > Furthermore, it allows for some extra restrictions to MetaModelClass
> with
> > > the following logic: If a class has exactly one instance where the
> "uri" of
> > > that instance equals the "class_uri" of the class, no more instances
> can be
> > > added And if there is an instance of a class without a "uri" that
> equals the
> > > "class_uri", no instances can be added where the "uri" of the instance
> > > equals the "class_uri" of the class. With that logic, we have proper
> > > singleton classes in the meta model of Neo4J.
> > >
> > > Kind regards,
> > > Niels Hoogeveen
> > >
> > > > Date: Thu, 8 Apr 2010 11:37:37 +0200
> > > > From: matt...@neotechnology.com
> > > > To: user@lists.neo4j.org
> > > > Subject: Re: [Neo] meta meta classes
> > > >
> > > > 2010/3/30 Niels Hoogeveen <pd_aficion...@hotmail.com>
> > > >
> > > > >
> > > > > MetaModelObject already has a getter (without using the word "get")
> to
> > > > > access the node.
> > > > >
> > > > > Wrapping MetaModelObject to give it a Node-interface makes it
> possible
> > > to
> > > > > directly write:
> > > > >
> > > > > metalObject.setProperty("a", b)
> > > > >
> > > > > instead of
> > > > >
> > > > > metaobject.node.setPropert("a", b)
> > > > >
> > > > > If that were all, I wouldn't make a post about it. The more
> interesting
> > > > > part is the meta modeling of the node gotten from a
> MetaModelObject.
> > > This
> > > > > node represents the class, but it is not an instance of any class
> > > itself.
> > > > > That's where the reify method comes into play, which takes the node
> > > from a
> > > > > MetaModelObject and creates a class with the same name, but in a
> > > different
> > > > > namespace, and makes the node an instance of this new class.
> > > > >
> > > > > With that construction it becomes possible to model the
> > > > > relationships/properties of a class.
> > > > >
> > > > > There are many examples where this can be handy.
> > > > >
> > > > > I already gave the example of HTML tags, where the attributes can
> be
> > > > > modeled as properties and the tagname as a property of the meta
> class.
> > > > >
> > > > > Another example is:
> > > > >
> > > > > All countries have subdivision. Countries and their subdivisions
> all
> > > are
> > > > > instances of a certain class. There is one class for country, but
> there
> > > is a
> > > > > set of classes for subdivisions. In some countries, a subdivision
> is
> > > called
> > > > > "province", in others it's a "state" or a "district". Subdivision
> of
> > > various
> > > > > countries can have different sets of properties and relations.
> > > > >
> > > > > How to model the fact that the instance "United States of America"
> has
> > > > > subdivisions of the class "State_(US)"? Using the reify method we
> can
> > > make a
> > > > > class "United States of America", where we can model that the
> > > ClassRange of
> > > > > "State_(US)" is "United States of America". Or if we want the
> > > relationship
> > > > > to point the other way, that the "United States of America" has 50
> (use
> > > of
> > > > > cardinality) subdivisions of the class "State_(US)".
> > > > >
> > > > Here you take a step into modeling the actual data into the meta
> model
> > > which
> > > > describes the data. Is it desirable to first model exactly how the
> data
> > > will
> > > > look, and then add data so that it looks like that? I get a feeling
> that
> > > the
> > > > data is described twice here...
> > > >
> > > > >
> > > > > Of course all this can directly be expressed with nodes and
> > > relationships,
> > > > > but that's what the meta model does anyway.
> > > > >
> > > > > I do have one peeve with the meta model API. The class DataRange
> has a
> > > > > constructor:
> > > > >
> > > > > DataRange(String datatype, Object... values)
> > > > >
> > > > > I'd much rather see a new Restrictable class Datavalue, and see a
> > > > > constructor:
> > > > >
> > > > > DataRange(String datatype, Datavalue... values)
> > > > >
> > > > > That way the possible values a property can have additional
> properties
> > > and
> > > > > relationships (eg. link to Wordnet definition or Wikipedia entry).
> > > > >
> > > > > Kind regards,
> > > > > Niels Hoogeveen
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > > > > Date: Tue, 30 Mar 2010 09:30:10 +0200
> > > > > > From: matt...@neotechnology.com
> > > > > > To: user@lists.neo4j.org
> > > > > > Subject: Re: [Neo] meta meta classes
> > > > > >
> > > > > > Would making the underlying Node publically available (via a
> getter)
> > > be
> > > > > > virtually the same thing? In that case the meta model classes
> could
> > > have
> > > > > > such a getter.
> > > > > >
> > > > > > 2010/3/26 Niels Hoogeveen <pd_aficion...@hotmail.com>
> > > > > >
> > > > > > >
> > > > > > > Hi Peter,
> > > > > > >
> > > > > > > I added a Wiki entry in my github repo called "Reification of
> meta
> > > > > classes
> > > > > > > and meta properties":
> > > > > > >
> > > > > > >
> > > > > > >
> > > > >
> > >
> http://wiki.github.com/NielsHoogeveen/Scala-Neo4j-utils/reification-of-meta-classes-and-meta-properties
> > > > > > >
> > > > > > > The source code for the Scala wrappers can be found found in my
> > > repo:
> > > > > > >
> > > > > > > http://github.com/NielsHoogeveen/Scala-Neo4j-utils
> > > > > > >
> > > > > > > Kind regards,
> > > > > > > Niels Hoogeveen
> > > > > > >
> > > > > > > > From: neubauer.pe...@gmail.com
> > > > > > > > Date: Fri, 26 Mar 2010 17:25:01 +0100
> > > > > > > > To: user@lists.neo4j.org
> > > > > > > > Subject: Re: [Neo] meta meta classes
> > > > > > > >
> > > > > > > > Awesome Niels!
> > > > > > > >
> > > > > > > > maybe you could blog or document some cool example on this?
> > > > > > > >
> > > > > > > > Cheers,
> > > > > > > >
> > > > > > > > /peter neubauer
> > > > > > > >
> > > > > > > > COO and Sales, Neo Technology
> > > > > > > >
> > > > > > > > GTalk: neubauer.peter
> > > > > > > > Skype peter.neubauer
> > > > > > > > Phone +46 704 106975
> > > > > > > > LinkedIn http://www.linkedin.com/in/neubauer
> > > > > > > > Twitter http://twitter.com/peterneubauer
> > > > > > > >
> > > > > > > > http://www.neo4j.org - Your high performance
> graph
> > > > > database.
> > > > > > > > http://www.tinkerpop.com - Processing for
> Internet-scale
> > > > > graphs.
> > > > > > > > http://www.thoughtmade.com - Scandinavias coolest
> Bring-a-Thing
> > > > > party.
> > > > > > > >
> > > > > > > >
> > > > > > > >
> > > > > > > > On Fri, Mar 26, 2010 at 5:22 PM, Niels Hoogeveen
> > > > > > > > <pd_aficion...@hotmail.com> wrote:
> > > > > > > > >
> > > > > > > > > Using Scala, I was actually able to extend MetaModelThing
> to
> > > act as
> > > > > a
> > > > > > > Node and MetaModelClass to have shadowing functionality for
> both
> > > > > > > MetaModelClasses and for MetaModelProperties, without touching
> the
> > > > > original
> > > > > > > source code.
> > > > > > > > >
> > > > > > > > >> To: user@lists.neo4j.org
> > > > > > > > >> From: rick.bullo...@burningskysoftware.com
> > > > > > > > >> Date: Fri, 26 Mar 2010 14:29:03 +0000
> > > > > > > > >> Subject: Re: [Neo] meta meta classes
> > > > > > > > >>
> > > > > > > > >> Such are the joys and challenges of frameworks and
> > > abstractions.
> > > > > > > Sometimes you do need to get "close to the metal" though, to
> > > achieve
> > > > > > > specific functional and performance requirements. Thus the
> reason
> > > open
> > > > > > > source frameworks are awesome. At least we can change and
> extend
> > > them
> > > > > more
> > > > > > > easily!
> > > > > > > > >>
> > > > > > > > >>
> > > > > > > > >>
> > > > > > > > >> -----Original Message-----
> > > > > > > > >> From: Niels Hoogeveen <pd_aficion...@hotmail.com>
> > > > > > > > >> Date: Fri, 26 Mar 2010 15:20:15
> > > > > > > > >> To: <user@lists.neo4j.org>
> > > > > > > > >> Subject: Re: [Neo] meta meta classes
> > > > > > > > >>
> > > > > > > > >>
> > > > > > > > >> Making MetaModelThing implement the Node interface is
> actually
> > > > > > > orthogonal to the creation of Shadow objects. Though it does
> make
> > > code
> > > > > using
> > > > > > > classes as objects cleaner, and allows the node property of
> > > > > MetaModelThing
> > > > > > > to become private.
> > > > > > > > >>
> > > > > > > > >> > From: pd_aficion...@hotmail.com
> > > > > > > > >> > To: user@lists.neo4j.org
> > > > > > > > >> > Date: Fri, 26 Mar 2010 14:38:08 +0100
> > > > > > > > >> > Subject: Re: [Neo] meta meta classes
> > > > > > > > >> >
> > > > > > > > >> >
> > > > > > > > >> > Or, and this probably the simplest solution. Let a
> > > > > MetaModelThing
> > > > > > > implement the Node interface. This allows a class to be an
> instance
> > > of
> > > > > > > another class and/or a SubType of another class.
> > > > > > > > >> >
> > > > > > > > >> >
> > > > > > > > >> > > From: pd_aficion...@hotmail.com
> > > > > > > > >> > > To: user@lists.neo4j.org
> > > > > > > > >> > > Date: Fri, 26 Mar 2010 14:20:07 +0100
> > > > > > > > >> > > Subject: Re: [Neo] meta meta classes
> > > > > > > > >> > >
> > > > > > > > >> > >
> > > > > > > > >> > > The class as object phenomenon is actually quite
> > > pervasive,
> > > > > and I
> > > > > > > think it is possible to have a generalized solution for it.
> > > > > > > > >> > >
> > > > > > > > >> > > After sending this email yesterday, I came up with a
> > > slightly
> > > > > > > different solution.
> > > > > > > > >> > >
> > > > > > > > >> > > val taggable = namespace.getMetaClass("taggable",
> true)
> > > > > > > > >> > >
> > > > > > > > >> > > val tagName =
> > > metaModelNamespace.getMetaProperty("tagname",
> > > > > true)
> > > > > > > > >> > > tagName.setCardinality(1)
> > > > > > > > >> > >
> > > > > > > > >> > > val metaTaggable =
> > > metaModelNamespace.getMetaClass("taggable",
> > > > > > > true)
> > > > > > > > >> > > metaTaggable.getDirectProperties.add(tagName)
> > > > > > > > >> > > metaTaggable.getDirectInstances.add(taggable.node)
> > > > > > > > >> > >
> > > > > > > > >> > > val body = namespace.getMetaClass("body", true)
> > > > > > > > >> > > taggable.getDirectSubs.add(body)
> > > > > > > > >> > >
> > > > > > > > >> > > Instead of directly relating the class "body" to the
> meta
> > > > > class
> > > > > > > "taggable", I create a shadow of the meta class "taggable" with
> the
> > > > > same
> > > > > > > name in the namespace of the class "body", and make "body" a
> > > subclass
> > > > > of
> > > > > > > this shadow. That way the sub classing relationship remains
> nicely
> > > in
> > > > > one
> > > > > > > name space, while the instance relationship transcends name
> spaces,
> > > as
> > > > > it
> > > > > > > should.
> > > > > > > > >> > >
> > > > > > > > >> > > This could in principle be generalized by adding a
> methods
> > > to
> > > > > > > MetaModelClass:
> > > > > > > > >> > >
> > > > > > > > >> > > public MetaModelClass createShadowClass(NameSpace ns){
> > > > > > > > >> > >
> > > > > > > > >> > > MetaModelClass mc =
> ns.getMetaClass(this.getName(),
> > > true);
> > > > > > > > >> > > this.getDirectInstances.add(mc.node);
> > > > > > > > >> > > return mc;
> > > > > > > > >> > > }
> > > > > > > > >> > >
> > > > > > > > >> > > This returns a shadow of a given MetaModelClass in a
> given
> > > > > > > namespace and adds it as a an instance of this.
> > > > > > > > >> > >
> > > > > > > > >> > > It would of course be nicer to have a method with the
> > > > > signature:
> > > > > > > > >> > >
> > > > > > > > >> > > public MetaModelClass getShadow(NameSpace ns, Boolean
> > > create)
> > > > > > > > >> > >
> > > > > > > > >> > > This is much more in line with the rest of the API,
> but
> > > > > requires a
> > > > > > > way to find out the namespace a given MetaModelClass is defined
> in.
> > > I
> > > > > didn't
> > > > > > > see a method getNamespace() for a given class, and didn't delve
> > > deeply
> > > > > > > enough in the source code to figure out how to do that.
> > > > > > > > >> > >
> > > > > > > > >> > > A similar approach can of course also be applied to
> > > > > > > MetaModelProperties, by adding the following method to
> > > MetaModelClass:
> > > > > > > > >> > >
> > > > > > > > >> > > public MetaModelProperty
> > > > > > > > >> > > createShadowProperty(NameSpace ns){
> > > > > > > > >> > >
> > > > > > > > >> > >
> > > > > > > > >> > >
> > > > > > > > >> > > MetaModelProperty mp =
> > > > > > > > >> > > ns.getMetaProperty(this.getName(), true);
> > > > > > > > >> > >
> > > > > > > > >> > >
> > > > > > > > >> > > this.getDirectInstances.add(mp.node);
> > > > > > > > >> > >
> > > > > > > > >> > > return mp;
> > > > > > > > >> > >
> > > > > > > > >> > > }
> > > > > > > > >> > >
> > > > > > > > >> > >
> > > > > > > > >> > > This way the underlying node of a MetaModelProperty
> can
> > > > > properly
> > > > > > > be used as a class of its own and have properties,
> relationships,
> > > that
> > > > > can
> > > > > > > be further modeled in the meta layer. This e.q. allows to set a
> > > default
> > > > > > > rendering format for a given property class.
> > > > > > > > >> > >
> > > > > > > > >> > > I don't see a MetaModelRelationships, which is
> > > unfortunate,
> > > > > since
> > > > > > > that would allow the modeling of the properties of a
> Relationship.
> > > > > > > > >> > >
> > > > > > > > >> > >
> > > > > > > > >> > > Kind regards,
> > > > > > > > >> > > Niels Hoogeveen
> > > > > > > > >> > >
> > > > > > > > >> > >
> > > > > > > > >> > > > Date: Fri, 26 Mar 2010 11:26:29 +0100
> > > > > > > > >> > > > From: matt...@neotechnology.com
> > > > > > > > >> > > > To: user@lists.neo4j.org
> > > > > > > > >> > > > Subject: Re: [Neo] meta meta classes
> > > > > > > > >> > > >
> > > > > > > > >> > > > That's an interresting case you've got here and it
> looks
> > > to
> > > > > me
> > > > > > > like it's
> > > > > > > > >> > > > probably the best way to model it in the meta model.
> > > > > > > > >> > > >
> > > > > > > > >> > > > 2010/3/25 Niels Hoogeveen <
> pd_aficion...@hotmail.com>
> > > > > > > > >> > > >
> > > > > > > > >> > > > >
> > > > > > > > >> > > > > For my application, I want to model an HTML
> template
> > > in
> > > > > Neo4J,
> > > > > > > using the
> > > > > > > > >> > > > > MetaModel api.
> > > > > > > > >> > > > >
> > > > > > > > >> > > > > So I started setting up MetaModelClasses for the
> > > various
> > > > > HTML
> > > > > > > entities.
> > > > > > > > >> > > > >
> > > > > > > > >> > > > > e.g. (code in Scala)
> > > > > > > > >> > > > >
> > > > > > > > >> > > > > val classProp = namespace.getMetaProperty("class",
> > > true)
> > > > > > > > >> > > > > val idProp =
> > > > > > > > >> > > > > namespace.getMetaProperty("id", true)
> > > > > > > > >> > > > > idProp.setCardinality(1)
> > > > > > > > >> > > > >
> > > > > > > > >> > > > >
> > > > > > > > >> > > > > val body = namespace.getMetaClass("body", true)
> > > > > > > > >> > > > > body.getDirectProperties(classProp)
> > > > > > > > >> > > > > body.getDirectProperties(idProp)
> > > > > > > > >> > > > >
> > > > > > > > >> > > > >
> > > > > > > > >> > > > > Which creates a class named "body" which has a
> > > property
> > > > > named
> > > > > > > "class"
> > > > > > > > >> > > > > without a cardinality restriction and a property
> named
> > > > > "id"
> > > > > > > with a
> > > > > > > > >> > > > > cardinality restriction of 1.
> > > > > > > > >> > > > >
> > > > > > > > >> > > > > Now I can create nodes of class "body" with
> various
> > > values
> > > > > for
> > > > > > > "class" and
> > > > > > > > >> > > > > for "id".
> > > > > > > > >> > > > >
> > > > > > > > >> > > > > So far so good, but now I want to say that the
> class
> > > body
> > > > > has
> > > > > > > a property
> > > > > > > > >> > > > > "tagname" which should get the value "body".
> > > > > > > > >> > > > >
> > > > > > > > >> > > > > The meta model itself doesn't allow classes to
> have
> > > > > > > properties, but it
> > > > > > > > >> > > > > allows access to the underlying node of the class.
> > > > > > > > >> > > > >
> > > > > > > > >> > > > > So I created a separate namespace for the meta
> meta
> > > > > classes
> > > > > > > and added the
> > > > > > > > >> > > > > following three definitions:
> > > > > > > > >> > > > >
> > > > > > > > >> > > > > val tagName =
> metaNamespace.getMetaProperty("tagname",
> > > > > true)
> > > > > > > > >> > > > > tagName.setCardinality(1)
> > > > > > > > >> > > > > val taggable =
> metaNamespace.getMetaClass("taggable",
> > > > > true)
> > > > > > > > >> > > > >
> > > > > > > > >> > > > > body.node.setProperty("tagname", "body")
> > > > > > > > >> > > > >
> > > > > > > > >> > > > > This creates a property "tagname" with the value
> > > "body"
> > > > > for
> > > > > > > the class named
> > > > > > > > >> > > > > "body".
> > > > > > > > >> > > > >
> > > > > > > > >> > > > > Now comes the more ambiguous part, how to link
> "body"
> > > to
> > > > > > > "taggable".
> > > > > > > > >> > > > >
> > > > > > > > >> > > > > I can make body.node an instance of taggable. Once
> > > there
> > > > > is a
> > > > > > > validator,
> > > > > > > > >> > > > > the existence of a "tagname" property with
> cardinality
> > > 1
> > > > > > > should be checked,
> > > > > > > > >> > > > > so it is reasonable to make body.node an instance
> of
> > > > > taggable.
> > > > > > > > >> > > > >
> > > > > > > > >> > > > > At the same time the class body is actually a
> subclass
> > > of
> > > > > > > taggable, so I am
> > > > > > > > >> > > > > inclined to define that as well.
> > > > > > > > >> > > > >
> > > > > > > > >> > > > > So I end up doing the following:
> > > > > > > > >> > > > >
> > > > > > > > >> > > > > taggable.getDirectInstances.add(body.node)
> > > > > > > > >> > > > > taggable.getDirectSubs.add(body)
> > > > > > > > >> > > > >
> > > > > > > > >> > > > > I would like to know if this is the correct
> approach
> > > to
> > > > > this
> > > > > > > situation, or
> > > > > > > > >> > > > > whether there are better alternatives.
> > > > > > > > >> > > > >
> > > > > > > > >> > > > > Kind regards,
> > > > > > > > >> > > > > Niels Hoogeveen
> > > > > > > > >> > > > >
> > > > > > > > >> > > > >
> > > > > > > > >> > > > >
> > > > > > >
> _________________________________________________________________
> > > > > > > > >> > > > > New Windows 7: Find the right PC for you. Learn
> more.
> > > > > > > > >> > > > > http://windows.microsoft.com/shop
> > > > > > > > >> > > > > _______________________________________________
> > > > > > > > >> > > > > Neo mailing list
> > > > > > > > >> > > > > User@lists.neo4j.org
> > > > > > > > >> > > > > https://lists.neo4j.org/mailman/listinfo/user
> > > > > > > > >> > > > >
> > > > > > > > >> > > >
> > > > > > > > >> > > >
> > > > > > > > >> > > >
> > > > > > > > >> > > > --
> > > > > > > > >> > > > Mattias Persson, [matt...@neotechnology.com]
> > > > > > > > >> > > > Neo Technology, www.neotechnology.com
> > > > > > > > >> > > > _______________________________________________
> > > > > > > > >> > > > Neo mailing list
> > > > > > > > >> > > > User@lists.neo4j.org
> > > > > > > > >> > > > https://lists.neo4j.org/mailman/listinfo/user
> > > > > > > > >> > >
> > > > > > > > >> > >
> > > > > _________________________________________________________________
> > > > > > > > >> > > Express yourself instantly with MSN Messenger!
> Download
> > > today
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> > > > > > > FREE!
> > > > > > > > >> > >
> > > > > http://messenger.msn.click-url.com/go/onm00200471ave/direct/01/
> > > > > > > > >> > > _______________________________________________
> > > > > > > > >> > > Neo mailing list
> > > > > > > > >> > > User@lists.neo4j.org
> > > > > > > > >> > > https://lists.neo4j.org/mailman/listinfo/user
> > > > > > > > >> >
> > > > > > > > >> >
> > > > > _________________________________________________________________
> > > > > > > > >> > New Windows 7: Find the right PC for you. Learn more.
> > > > > > > > >> > http://windows.microsoft.com/shop
> > > > > > > > >> > _______________________________________________
> > > > > > > > >> > Neo mailing list
> > > > > > > > >> > User@lists.neo4j.org
> > > > > > > > >> > https://lists.neo4j.org/mailman/listinfo/user
> > > > > > > > >>
> > > > > > > > >>
> > > _________________________________________________________________
> > > > > > > > >> New Windows 7: Find the right PC for you. Learn more.
> > > > > > > > >> http://windows.microsoft.com/shop
> > > > > > > > >> _______________________________________________
> > > > > > > > >> Neo mailing list
> > > > > > > > >> User@lists.neo4j.org
> > > > > > > > >> https://lists.neo4j.org/mailman/listinfo/user
> > > > > > > > >> _______________________________________________
> > > > > > > > >> Neo mailing list
> > > > > > > > >> User@lists.neo4j.org
> > > > > > > > >> https://lists.neo4j.org/mailman/listinfo/user
> > > > > > > > >
> > > > > > > > >
> > > _________________________________________________________________
> > > > > > > > > New Windows 7: Find the right PC for you. Learn more.
> > > > > > > > > http://windows.microsoft.com/shop
> > > > > > > > > _______________________________________________
> > > > > > > > > Neo mailing list
> > > > > > > > > User@lists.neo4j.org
> > > > > > > > > https://lists.neo4j.org/mailman/listinfo/user
> > > > > > > > >
> > > > > > > > _______________________________________________
> > > > > > > > Neo mailing list
> > > > > > > > User@lists.neo4j.org
> > > > > > > > https://lists.neo4j.org/mailman/listinfo/user
> > > > > > >
> > > > > > >
> _________________________________________________________________
> > > > > > > Express yourself instantly with MSN Messenger! Download today
> it's
> > > > > FREE!
> > > > > > >
> http://messenger.msn.click-url.com/go/onm00200471ave/direct/01/
> > > > > > > _______________________________________________
> > > > > > > Neo mailing list
> > > > > > > User@lists.neo4j.org
> > > > > > > https://lists.neo4j.org/mailman/listinfo/user
> > > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > > > --
> > > > > > Mattias Persson, [matt...@neotechnology.com]
> > > > > > Neo Technology, www.neotechnology.com
> > > > > > _______________________________________________
> > > > > > Neo mailing list
> > > > > > User@lists.neo4j.org
> > > > > > https://lists.neo4j.org/mailman/listinfo/user
> > > > >
> > > > > _________________________________________________________________
> > > > > Express yourself instantly with MSN Messenger! Download today it's
> > > FREE!
> > > > > http://messenger.msn.click-url.com/go/onm00200471ave/direct/01/
> > > > > _______________________________________________
> > > > > Neo mailing list
> > > > > User@lists.neo4j.org
> > > > > https://lists.neo4j.org/mailman/listinfo/user
> > > > >
> > > >
> > > >
> > > >
> > > > --
> > > > Mattias Persson, [matt...@neotechnology.com]
> > > > Hacker, Neo Technology
> > > > www.neotechnology.com
> > > > _______________________________________________
> > > > Neo mailing list
> > > > User@lists.neo4j.org
> > > > https://lists.neo4j.org/mailman/listinfo/user
> > >
> > > _________________________________________________________________
> > > Express yourself instantly with MSN Messenger! Download today it's
> FREE!
> > > http://messenger.msn.click-url.com/go/onm00200471ave/direct/01/
> > > _______________________________________________
> > > Neo mailing list
> > > User@lists.neo4j.org
> > > https://lists.neo4j.org/mailman/listinfo/user
> > >
> >
> >
> >
> > --
> > Mattias Persson, [matt...@neotechnology.com]
> > Hacker, Neo Technology
> > www.neotechnology.com
> > _______________________________________________
> > Neo mailing list
> > User@lists.neo4j.org
> > https://lists.neo4j.org/mailman/listinfo/user
>
> _________________________________________________________________
> New Windows 7: Find the right PC for you. Learn more.
> http://windows.microsoft.com/shop
> _______________________________________________
> Neo mailing list
> User@lists.neo4j.org
> https://lists.neo4j.org/mailman/listinfo/user
>
--
Mattias Persson, [matt...@neotechnology.com]
Hacker, Neo Technology
www.neotechnology.com
_______________________________________________
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