قالب:Data Europe

هذا القالب يحوي عدة مفردات بيانات استرجاع بشكل مستقل عن Europe في شكل قيم إحداثي قالب متغير حسب الاختيار، بطريقة موحدة. وهو عضو في عائلة القوالب التي تبدأ بكلمة "Data" في تصنيف:قوالب بيانات بلد. النظام المستخدم مشابه لWikipedia:WikiProject Flag Template.

إحداثيات

اسم الإحداثي	القيمة	المعنى
1	Europe	last part of template name, used to identify it within the family of templates
article		article name; needs to be specified only if it differs from Europe; in applications, use [[{{{article|{{{1}}}}}}]] to link to the article (as has been done at the top of this page)
short name		shorter display name to be used in some contexts; an application or application parameter can specify whether this is used; only intended for dispensing with disambiguation in a context where it is not needed
type	continent	type of entity, e.g. continent, country, province, municipality
code		code
code description		code description
continent		continent, if type is lower than "continent"
country		country, if type is lower than "country"
province		province, if type is lower than "province"
popbase	731,000,000	population on a given date (stored without commas)
popbaseyear	2009	year for which the population base figure applies
popbasemonth		month for which the population base figure applies
popbaseday		day for which the population base figure applies
popinc		population increase per day; used to extrapolate the population figure
land area		land area in km2 (stored without commas)
total area	10,180,000	total area in km2 (stored without commas)
flag image	Standard map of Europe (blank).png	name of the flag image (or other illustration, if there is no flag) shown above

Throughout the family of templates, fixed names are used for the parameters. (The parameter names are kept short to reduce counts for the ويكيبيديا:حدود القوالب and the ويكيبيديا:حدود القوالب in cases where these are applicable.) However, not necessarily all parameters have been given a value: some parameters may not be applicable, while for some other parameters the value may just have not been specified yet. The table shows all parameters, and for each the value, if specified.

بيانات مشتقة

The population is 69988350000000000008.35% of that of the world.

The total area is 10,180,000 كيلومتر مربعs (3,930,000 ميل²). It is 69986830000000000006.83% of the land area of the world.

The population density is 71.8 لكل كيلومتر مربع (186.0/ميل²) total area.

استرجاع مفردات بيانات

{{data Europe|pst2|land area}}, using parameter selection template قالب:Pst2, gives the parameter land area, etc.

For retrieval of more data items it is more efficient to prepare a template for that, to be used as follows:

{{data Europe|template name|..|..|..|..}}

so that this data template needs to be called only once. The default template is قالب:Show data, producing this page.

The four parameters are optional, they are passed on to the prepared template as parameters 2-5.

Special templates:

• قالب:Linkd - link to article
• قالب:Poptoday - used above
• قالب:كثافة سكانية - for use on the page قائمة الدول والتبعيات حسب الكثافة السكانية
• قالب:Poptoday 1 - for use on the page لستة البلاد حسب عدد السكان
• قالب:Popareadens - for use on the page لستة البلاد حسب عدد السكان

A parameter being undefined or empty typically means the same, see below. {{data ..|pst2|..}} gives the empty string and the text "{{{..}}}", respectively. Therefore an application checking the parameter has to check both. Checking whether a result is equal to e.g. the text "" cannot be done directly with #ifeq in a template which itself has also a parameter with that name, because if that is defined, there would be a comparison with the value instead of the text itself. Instead, it can be checked whether the first character of the result is "{", e.g.: {{#ifeq:{{padleft:|1|{{data {{{continent}}}|pst2|popinc}}}}|{|..|..}}.

إنشاء قوالب بيانات جديدة

قالب:Data/preload can be used to create new data templates. On the page of the data template of a province, if there is no data template yet for the country, a link appears to create that, preloading this template. Otherwise the wikitext can be copied to the new data template. For parameters which are not applicable, such as country for a country, the parameter definition "country=" can be deleted. For parameters to be filled in later the parameter definition like "popinc=" (specifying the empty string as value) can be left in the wikitext to be filled in later. Do not forget parameter 1.

الكفاءة

In this template system each template contains various properties of a single entity, as opposed to the other common system, where a template contains one property (e.g. population or area) of many entities. Although that other system can be convenient if updates of a property for all these entities become available together, in the case of large-scale use of data on one page that other system can be problematic due to its inefficiency. This is because of the following:

• There are often more entities than properties, and ويكيبيديا:حدود القوالب (or in the case of #switch, average page counts) are proportional to the number of data items in the data template (if they are stored in a linear way, not in a tree, and not stored as unnamed parameters).
• In the case of large-scale use of data on one page there are usually one or more tables, where an entity forms a row and a property a column, because there are often more entities than properties, and because this way the sorting feature allows sorting entities based on a property. In this template system this allows producing a row with only one call of the data template, making the count not grow faster than proportional to the average number of data items stored per data template, times the number of entities in the table.

The include part of the data template of an entity does not contain a long list of its sub-entities or their properties, because that would make this method inefficient too.

Until here the documentation is automatically generated by قالب:Show data.