See http://www.k-zone.cn/zblog/post/flash-builder-gumbo-namespace-spark-halo.html for details
This article is the third article in Flash Builder 4 beta (gumbo) UI and new functions experience. It focuses on the namespace added by Flex SDK 4 (gumbo ).
As we all know, flex SDK 4 (gumbo) has added some namespaces, please refer to the following:
Xmlns: FX = "http://ns.adobe.com/mxml/2009"
Xmlns: MX = "Library: // ns.adobe.com/flex/halo"
Xmlns: S = "Library: // ns.adobe.com/flex/spark"
1. xmlns: FX = "http://ns.adobe.com/mxml/2009"
Defines some top-level methods, global functions, and global constants of top-level ActionScript 3.0.
For example, some common data types include number, Int, Boolean, array, and string.
The link in Adobe Flex 4 beta Language Reference is described in detail.
The contents of this namespace are all defined in the sdks \ 4.0.0 \ frameworks \ mxml-2009-manifest.xml under the flash builder installation directory.
2. xmlns: MX = "Library: // ns.adobe.com/flex/halo"
Friends who have used flex SDK 2 and flex SDK 3 will not be unfamiliar. The content in this namespace is MX. * For all the following content, please note that halo is named as the default CSS style in flex SDK 2 and flex SDK 3.
The contents of this namespace are all defined in the sdks \ 4.0.0 \ frameworks \ halo-manifest.xml under the flash builder installation directory.
3. xmlns: S = "Library: // ns.adobe.com/flex/spark"
This is the new component library in flex SDK 4 (gumbo. It contains all spark. * In Flex SDK 4 (gumbo) and some content in flashx. * packages (Text framework class)
The contents of this namespace are all defined in the sdks \ 4.0.0 \ frameworks \ spark-manifest.xml under the flash builder installation directory.
Some of the content that I think is necessary to understand:
1. xmlns: MX = "Library: // ns.adobe.com/flex/halo" and xmlns: S = "Library: // ns.adobe.com/flex/spark" are classified, while xmlns: FX = "http://ns.adobe.com/mxml/2009" is the top-level content of ActionScript 3.0. That is to say, if only halo is used in a project, the spark definition can be removed from the application. (And vice versa)
2. xmlns: MX = "Library: // ns.adobe.com/flex/halo" and xmlns: S = "Library: // ns.adobe.com/flex/spark", some of which are public, please pay attention to this point (I guess it is to migrate flex SDK 2 and flex SDK 3 to flex SDK 4 (gumbo) the process is more convenient .)
3. xmlns: FX = "http://ns.adobe.com/mxml/2009" retains some of the top-level packages in the flex SDK 2 and flex SDK 3 era, some new labels are added, such: <declarations> and <designlayer> <library> <private> <reparent>
4. When you need to define a component that exists in both xmlns: MX = "Library: // ns.adobe.com/flex/halo" and xmlns: S = "Library: // nsadobe.com/flex/spark" or has the same meaning, adobe recommends spark instead of Halo.
PS: Part of this article is from two Adobe documents, using Adobe Flex 4 and Adobe Flex gumbo preview release features and Migration Guide.
Appendix:
Using Adobe Flex 4: http://bit.ly/9u5D5
Adobe Flex gumbo preview release features and Migration Guide: http://bit.ly/180oH9
