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What does this mean? .................................................................................................................Double colon
Sometimes you see words which have a double colon "::" in the middle, for example date::date. Most often when you are referring to attributes by name, for example when building up a search criterion. The double colon is used in a number of places in openJean as a separator to distinguish between two parts of a name. Most often this is the full name of an attribute which has two parts, the name of the page and the name of the attribute itself. Technically it makes life a lot simpler when names for objects are all in one, not split up into parts, however if we use the common punctuation symbols to separate the parts then we can cause problems beacuse the parts of the name may themselves contain that punctuation symbol and we could not then distinguish between the symbol used as a separator and the symbol used as part of a name. It is very unlikely that a double colon would be used in a name so it can safely be used as a separator.
This does mean that you cannot use the double colon as part of a name in openJean!
Top .................................................................................................................Index
An index is a way of automatically generating groups of items, depending on values of attributes. For example in Freelancer one attribute contains the cost of a piece of work. Supposing that you want to see those jobs that were less than £100, those between £100 and £200, and those over £200. Instead of looking at each of them individually and placing them into a group, you can go to the category that contains these items and define an index, specifying the ranges of values for each index group. Not only will openJean then run through every item in the category placing it into the correct index group, it will also automatically put every new item in that category into the correct group as it is created and if the attribute is later changed the item will be re-indexed. If you then decide that you no longer require the index then a single command removes the lot, leaving all the items intact of course.
Top .................................................................................................................Category
A type of Node that can contain any other sort of node. The main purpose of openJean is to sort information stored as Items into categories. The name that is used for a category may be changed for a specific application, but throughout this documentation the term category will be used.
Top .................................................................................................................Group
A type of Node that can contain other groups and Items but not categories.The main structure of a openJean Catalog is of items within categories. Groups provide an additional way of structuring a number of items within a category. A major feature of a group is that certain operations can be carried out on a group that will automatically apply that operation to all the items within that group. A different name for a group may be used in a specific application, but the term group will be used throughout this manual.
Top .................................................................................................................Item
The main unit of information storage within openJean. Information, or references to where information is stored, are kept within a openJean item. The collection of Items is stored in a openJean Catalog and organised into categories and Items
Top .................................................................................................................Node
The Generic term for a Category, Group or Item. Nodes contain attributes in which information is stored. A openJean Catalog consists of a network of nodes.
Top .................................................................................................................Read only
An Attribute may be defined as read only. This means that it cannot normally be edited. Editing can be achieved through the Node Editor
Top .................................................................................................................Container
A Container node is one that can have descendants In other words it is either a Category or a Group.
Top .................................................................................................................Catalog
An openJean Component that displays the graph of nodes and their inter-relationships.
Top .................................................................................................................ETV
Export Transform and View is a standard way of extracting information from openJean and viewing it using a standard web browser.
Top .................................................................................................................root
The root of an openJean Catalog is the single node, that is the one common ancestor of all other nodes. It is the starting point for navigation through the catalog.
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