Header：上圖藍(lán)色和淺綠色文字。

A header is a single line defining a mapping of the following value lines to the type system. A header applies to all processed value lines until the next header or until the end of file, whichever comes first. You can put any number of headers into a CSV file.

定義了接下來(lái)value line和type系統(tǒng)的映射關(guān)系。

格式：

mode type[modifier=value];attribute[modifier=value];attribute[modifier=value];attribute[modifier=value][;...];attribute[modifier=value]

方框里的modifier：Gives additional information for translating a value record to the mapped type attribute

例子：INSERT_UPDATE

category;code[unique=true];name[lang=de];name[lang=en];$supercategories;$thumbnail;description[lang=de];order

This header states that each following value line creates or updates a category instance, until another header occurs. 注意，大小寫(xiě)無(wú)關(guān)。

INSERT Address;firstname;owner(Principal.uid|AbstractOrder.code) ;Hans;admin ;Klaus;O-K2006-C0000-001

由|分隔開(kāi)的語(yǔ)法叫 alternative pattern.

When importing the first value line ;Hans;admin, the ImpEx extension searches all instances of the Principal type to verify if any instance exists where the uid attribute is set to admin.

Impex extension首先查找所有principal實(shí)例，看是否存在其uid屬性值為admin的實(shí)例。

注意我們現(xiàn)在是試圖插入Address數(shù)據(jù)，如果上述的搜索命中，則將Impex語(yǔ)句里的address值維護(hù)到搜索命中的admin Principal實(shí)例去。

If an instance exists (and there is, by platform default), the new instance of the Address type has its owner attribute set to a reference to that Principal type instance.

如果并沒(méi)有Principal實(shí)例，其uid屬性等于admin，那么進(jìn)行第二輪搜索，根據(jù)AbstractOrder的code字段進(jìn)行搜索。

Attribute modifier

…;attribute[modifier=value,modifier=value,modifier=value];…
或者
…;attribute[modifier=value][modifier=value][modifier=value];…

The value of the $catalog macro sets the catalog id. The value of the $version macro sets the version string of the catalog version to export.

$catalog=clothescatalog
$version=Staged

宏的實(shí)現(xiàn)：

$catalog=catalog(id)
$catalogVersion=catalogVersion($catalog,version)

總結(jié)

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