Binding a URL to custom SVG container's BindableProperty - xamarin.forms

Question

I have been using the code layout here to create an SVG container for a Xamarin Forms project. It works well and I reconfigured it to read the image from a remote URL.
The ResourceId is from the source above:
public static readonly BindableProperty SvgUriProperty = BindableProperty.Create(
"ResourceId",
typeof(string),
typeof(SvgUriContainer),
default(string),
propertyChanged: RedrawCanvas);
public string ResourceId
{
get => (string)GetValue(SvgUriProperty);
set => SetValue(SvgUriProperty, value);
}
However I can not seem to bind that URL at run time in the XAML:
<control:SvgUriContainer
Grid.Row="0"
Grid.RowSpan="4"
Grid.Column="0"
ResourceId="{Binding StampUri}"
[...]
/>
That Binding returns a string and the rest of the bindings work fine. Any attempt to bind in that fashion results in a build error:
No property, bindable property, or event found for 'ResourceId', or mismatching type between value and property.
No matter what I do in the container logic with the BindablePropertycreation, the error is the same and is in the XAML. Am I getting the syntax wrong in the XAML? Is it because Binding is a BindingExtension (not a string) at build time?
Note: if I replace the Binding with a string/URL it all works fine.
Note: if I set the type of ResourceId to object I can get by the build error but the string does not resolve, of course.

Answer 1

Can you try to modify your bindableProperty to the standard format described in document:
public static readonly BindableProperty SvgUriProperty = BindableProperty.Create(
"SvgUri",
typeof(string),
typeof(EventToCommandBehavior),
"test",
propertyChanged: RedrawCanvas);
public string SvgUri
{
get => (string)GetValue(SvgUriProperty);
set => SetValue(SvgUriProperty, value);
}
Xamarin requires a Property naming convention.