Naming Conventions
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Folders
Folders are irrelevant to XML but important to control versioning of released files and ownership of these files.
- Taxonomy files MUST be released as children of a folder.
- The top level folder of any taxonomy MUST represent the owner of the taxonomy files.
- The first level of sub folders MUST represent the content of the taxonomy files:
- dict for metrics, dimensions, domains, members, families and perspectives;
- fws for frameworks, taxonomies, tables, modules and other concepts that constitute the reporting requirements;
- The first level of sub folders MAY represent the content of other taxonomy files:
- ext for models;
- func for functions for (formula) validations;
- The second level of sub folders for the fws folder MUST represent the reporting framework in which the taxonomy resides;
- The third level of sub folders for the reporting framework MUST represent the status of the files within;
- The fourth level of sub folders for the status of the reporting framwork MUST represent the release date of the taxonomy files inside.
- If dates are used to name folders, its notation MUST be: CCYYMMDD (no dashes or other characters).
- Folder names MUST be in lower case.
- Folder names MUST NOT use spaces (if a seperator is needed, an underscore is advised)
Example:
- root
- dict
- fws
- finrep
- normative
- 20131201
- normative
- finrep
- ext
- func
File names
File names are irrelevant to XML but the XBRL adoption of XPointer that addresses @id in named files makes it necessary to have rules on the file names:
Schema file names
- File names MUST be in lower case;
- File names MUST NOT be longer than 15 characters;
- File names MUST NOT use spaces (if a seperator is need an underscore is advised);
- File name extension '.xsd' MUST be used for schema files;
- Schema file names MUST represent their technical content according to the following table:
| File name | Content |
|---|---|
| tab | tables |
| met | metrics |
| dim | dimensions |
| exp | explicit domains |
| typ | typed domains |
| mem | explicit domain members |
| fam | families |
| pers | perspectives |
| hier | member hierarchies |
| fws | frameworks |
| ? | modules |
Linkbase file names
- File names MUST be in lower case;
- File name extension '.xml' MUST be used for linkbase files;
- File names MUST NOT use spaces (if a seperator is needed an underscore is advised);
- Linkbase file names are created according to the following patterns:
2.1 and generic label linkbase
Label linkbases are broken up per language used. The name of the label linkbase is concatenated from:
{main file}-lab-{lang}.xml
Where:
{main file} = corresponds to the name of the schema or linkbase file where the concept or resource is defined without its extension;
{lang} = corresponds to the ISO 639-1 code of the language (in lower case).
In case of needing any region or country code to identify the language in more detail, the following notation MUST be used:
{main-file}-lab-{lang}-{country}.xml
Where:
{country} = corresponds to the ISO 639-2 code of the region or country (in lower case).
2.1 and generic reference linkbase
{main file}-ref.xml
dimension-domain linkbases
domain-member linkbases
{33}-def.xml
table-dimension linkbases
metrics-table linkbases
presentation linkbases
{33}-pre.xml
calculation linkbases
{33}-cal.xml
formula linkbases
table linkbases
table column and row code linkbase
Some concepts of the taxonomy may refer to codes needed for the codes given to the columns and rows of tables. A linkbase is used to refer to these codes, which are represented in label resources. The name of this linkbase is constructed as follows:
{main file}-lab-codes.xml
Where:
{main file} = corresponds to the name of the schema or linkbase file where the concept or resource is defined without its extension;
33 = the name of schema file where the children of the hosted relationships are created.
Namespaces
Namespaces are the unique identifier of a schema file and part of the key on all the content that is created in that schema file. A namespace can be written as an URI or URN. With an URI there is an expectancy that it really identifies the schema. An URN is 'just' a name. A much used practice is to express URI's as URL's without the extension of the actual file it addresses. These URI's are being used as URL's to store the schema file on a server that can be called from software.
A (target)namespace in a schema is often abbreviated with a namespace prefix. This allows for shorthand qualified names to be used inside schema's. Not all XML software can handle schema's that have no namespace prefix assigned to them, and will generate a warning or error. As a consequence two strings are being created and have naming conventions assigned to them.
Target namespace
- Namespaces MUST be in lower case;
- Namespaces MUST reflect URI's;
- Namespaces MUST reflect the actual location (URL) that the schemas are accessable by software (no GUI);
DTS Authors are free to assign any webserver address, however since the URI represents the physical location, the names of folders will automatically form the 'end' of the URI assigned.
Example for the finrep metrics schema at EBA:
xbrl.eba.europa.eu/.../dict/met.xsd
Where the dots represent any folder structure EBA finds appropriate.
Different concepts are stored in different schemas, each carrying their own namespace, location and prefix. The table below shows how their names are constructed.
Namespace prefix
- Namespace prefix' MUST be in lower case;
- Namespace prefix' MUST only use characters a-z0-9, -, _;
- Namespace prefix' MUST be a concatenation of the owner of the schema file, underscore, name of the schema file without the extension which MAY be followed by another underscore and a two letter subdivision;
Examples:
eba_met
eba_mod_xx
See also: Reserved namespaces
| Type of concept | Location | Namespace | Prefix |
| Dimensions | {oloc}/dict/dim/dim.xsd | {ons}/dict/dim | {opre}_dim |
| Explicit domains | {oloc}/dict/dom/exp.xst | {ons}/dict/exp | {opre}_exp |
| Families | {oloc}/dict/dim/fam.xsd | {ons}/dict/fam | {opre}_fam |
| Members | {oloc}/dict/dom/{dc}/mem.xsd | {ons}/dict/dom/{dc} | {opre}_{dc} |
| Metrics | {oloc}/dict/met/met.xsd | {ons}/dict/met | {opre}_met |
| Perspectives | {oloc}/dict/dim/pers.xsd | {ons}/dict/pers | {opre}_pers |
| Typed domains | {oloc}/dict/dom/typ.xsd | {ons}/dict/typ | {opre}_typ |
Where:
{oloc} = official location of taxonomy files of the owner of the concepts
{ons} = its base namespace
{opre} = the prefix of its base namespace
{dc} = the code of a domain
Example from EBA (metrics):
Location: http://www.eba.europa.eu/eu/fr/xbrl/dict/met/met.xsd
Namespace: http://www.eba.europa.eu/xbrl/dict/met
Prefix: eba_met
Concepts
Local name (@name)
The local name of a concept is formed by multiple parts:
{Assigned letter}{Periodtype letter}
| Concept type | Model data type | XBRL data type | Assigned letter | Measure |
| Metrics | Boolean | xbrli:booleanItemType | b | no unit |
| Metrics | Date | xbrli:dateItemType | d | no unit |
| Metrics | Decimal | xbrli:decimalItemType | p | xbrli:pure |
| Metrics | Integer | xbrli:integerItemType | i | xbrli:pure |
| Metrics | Monetary | xbrli:monetaryItemType | m | iso4217: |
| Metrics | Percent | num:percentItemType | p | xbrli:pure |
| Metrics | Text | xbrli:stringItemType | s | no unit |
| Explicit domain | xbrli:qnameItemType | e | no unit | |
| Typed domain | Domain corresponding data type, codification letter and measure. |
Periodtype letters are:
i = instant
d = duration
Example:
Monetary instant concept: @name="mi" @id=eba_mi
Identifier (@id)
The identifier of a concept is constructed:
{opre}_{name}
Where:
{opre} = the prefix of the base namespace of the owner of the concept
{name} = as put in the @name
