Add an xml string as new shape in the current slide. This function is to be used to add custom openxml code.
ph_from_xml(x, value, type = "body", index = 1)ph_from_xml_at(x, value, left, top, width, height)
a pptx device
a character
placeholder type (i.e. 'body', 'title')
placeholder index (integer). This is to be used when a placeholder type
is not unique in the current slide, e.g. two placeholders with type 'body', the first
one will be added with index 1 and the second one with index 2.
It is recommanded to use argument location instead of type and
index.
location of the new shape on the slide
shape size in inches