Cannot add a namespace to html tag

[isitinschi]

When I am trying to add a namespace to an html tag I have an exception "java.lang.IllegalArgumentException: Tag html has invalid attribute name xmlns"

createHTML().html {
      attributes["xmlns"] = "http://www.w3.org/1999/xhtml"
      ...
}

According to w3c it is an absolutely valid scenario.

Also it is impossible to set a namespace like this:

createHTML().html {
      namespace = "http://www.w3.org/1999/xhtml"
      ...
}

because namespace is a val and cannot be reassigned.

Exception happens in stream.kt after attribute validation (isValidXmlAttributeName() method call). As I see, any attribute which starts with "xml" prefix is considered invalid (is there a reason for this?).

[cy6erGn0m]

Am I right that the only usecase is to set html's namespace?

[isitinschi]

According to this, any tag can have a namespace. But I am mostly interested in html tag.

[cy6erGn0m]

Currently setting attributes with namespace is not supported this is why it doesn't pass particular characters like colons and doesn't allow any attribute names starting with 'xml' (because these are reserved by the XML specification).

Currently the only supported namespace-related feature is setting namespace at tag construction (that is required, for example, for SVG).

namespace property couldn't be modifiable because there is no way to amend it for an existing DOM element unless recreate the element and all the children.

Also note that in spite of that any tag can have a namespace, assiging a namespace to a tag will make it completely different tag from browser's point of view. This is why I think that there is no reason for an tag like span or a to have an assignable namespace property. The html tag is an exception so I believe the quick workaround is to add optional namespace parameter to html {} function

[isitinschi]

The html tag is an exception so I believe the quick workaround is to add optional namespace parameter to html {} function

Sounds good. Will you work on it or guide me how to implement it?

[cy6erGn0m]

That's easy to workaround. You can create a custom tag NamespacedHTML that is completely identical to the original one except that it have a namespace: https://github.com/Kotlin/kotlinx.html/wiki/Micro-templating-and-DSL-customizing#introduce-custom-tag

Note that the original implementation is declared as following

# ag 'class HTML\('        
shared/src/main/kotlin/generated/gen-tags-h.kt
129:open class HTML(initialAttributes : Map<String, String>, override val consumer : TagConsumer<*>) : HTMLTag("html", consumer, initialAttributes, null, false, false), CommonAttributeGroupFacade {

Notice null argument here that is passed for namespace parameter. The only you need is to specify the correct value instead. I believe it should work properly at least for streaming mode.

Changing the original functions to provide namespace parameter is more difficult because they are generated so it's not so easy to fix. This am going to fix myself soon during the next development iteration.

[cy6erGn0m]

Fixed in 0.6.10

[isitinschi]

Thank you!