Gremlin & Inheritance like trees

[jerome moliere]

Hi all,

part from my graph contains some structures using an inheritance form.

I deal with categories , any category can be the mother of many others ...

Is there some special pattern & syntax tips to help me finding all category instances or all nodes(vertices) being children from a given category.

On my vertices I have some properties:

- name

- type (= 'Category for all category instances)

And a mother category is linked to a sub-category with an edge 'is child from'

Thanks for your help

Kind regards

jerome

PS:

I 'll just complain that many docs contain a tree path syntax and I cannot use this syntax from my gremlin console.

It 's a little bit confusing .Is it a bug or problem in my install but something like ./V/inE[@label='foo'] does not work

It's a sample and all examples extracted from slides refuse to work...

PS 2:

I was quite relax with the Cypher syntax but I am not so relax with the Gremlin's one...

[Marko Rodriguez]

Hi,

> I 'll just complain that many docs contain a tree path syntax and I cannot use this syntax from my gremlin console.
> It 's a little bit confusing .Is it a bug or problem in my install but something like ./V/inE[@label='foo'] does not work

> It's a sample and all examples extracted from slides refuse to work…

That is Gremlin probably version 0.1-0.2 (over 3 years old). You will want to read the Gremlin docs.

http://gremlin.tinkerpop.com

Slides get dated …. Wiki documentation is always current.

Good luck,
Marko.

http://markorodriguez.com

[jerome moliere]

Ok marko thanks for your answer..

So no point trying to make this syntax works...Ok...

And about inheritance trees how do you handle that in Gremlin?

Most of the samples assume that we know where to start (vertex's index) but when you have no idea at all ?

Should I use technical IDs indexed to start the queries at the good vertex ?

In samples v(89) is a song writer while v(1) is the index for Marko in the small graph used in the docs ...

While using Neo4J I noticed that even the APi provides a way to get the id for any vertex ,it 's a very bad practice to use them because they can be reused at any moment...

Kind regards

Jerome

J.MOLIERE - Mentor/J
auteur Eyrolles
blog: http://romjethoughts.blogspot.com
OSGi book available now!!!

2013/2/13 Marko Rodriguez <okram...@gmail.com>

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[Marko Rodriguez]

Hi,

You would use indices. In Gremlin:

g.V('name','marko').out.out….

Please look over Blueprints and Gremlin documentation for getting started.

http://blueprints.tinkerpop.com

http://gremlin.tinkerpop.com

Marko.

http://markorodriguez.com

[jerome moliere]

Thanks

J.MOLIERE - Mentor/J
auteur Eyrolles
blog: http://romjethoughts.blogspot.com
OSGi book available now!!!

2013/2/13 Marko Rodriguez <okram...@gmail.com>

Hi,