Trait AsOptionalXmlText 

pub trait AsOptionalXmlText {
    // Required method
    fn as_optional_xml_text(&self) -> Result<Option<Cow<'_, str>>, Error>;
}

Specialized variant of AsXmlText.

Normally, it should not be necessary to implement this trait as it is automatically implemented for all types implementing AsXmlText. However, if your type can only be serialised as an XML attribute (for example because an absent value has a particular meaning), it is correct to implement AsOptionalXmlText instead of AsXmlText.

 If your type can be serialised as both (text and attribute) but needs special handling in attributes, implement AsXmlText but provide a custom implementation of AsXmlText::as_optional_xml_text.

Important: See the text module’s documentation for notes regarding implementations for types from third-party crates.

Required Methods

fn as_optional_xml_text(&self) -> Result<Option<Cow<'_, str>>, Error>

Convert the value to an XML string in a context where an absent value can be represented.

Implementations on Foreign Types

impl<T: AsXmlText> AsOptionalXmlText for Option<T>

fn as_optional_xml_text(&self) -> Result<Option<Cow<'_, str>>, Error>

Implementors

impl<T: AsXmlText> AsOptionalXmlText for T