基于this article，应执行以下操作：

@Root(name = "texts", strict = false)
class Texts @JvmOverloads constructor(
    @field:ElementList(inline = true)
    var textList: List<Text>? = null
)
@Root(name = "text", strict = false)
class Text @JvmOverloads constructor(
    @field:Attribute(name = "id")
    var id: String = "",
    @field:Element(name = "title")
    var title: String = "",
    @field:Element(name = "creation")
    var creation: String = "",
    @field:Element(name = "valid_from")
    var validFrom: String = "",
    @field:Element(name = "valid_to")
    var validTo: String = "",
    @field:Element(name = "content")
    var content: String = "",
)