[Mass-Market-GEO] kml:description content model

Michael Ashbridge mashbridge at google.com
Wed Aug 27 15:05:21 EDT 2008

It _should_ be, yes. Historically it is not because the the content of
<description> is mostly* not an interesting part of KML -- it's just a
blob that gets handed to a lump of code that renders the feature
balloon. In that case you never want your KML parser to see any of it,
hence wrapping in CDATA.

[*] More interesting to consider is how/if to surface the concept of a
link better in KML. As things stand with OGC KML 2.2, there _is_ the
concept of a feature anchor link that is inlined with the content of
description, so the above paragraph isn't totally accurate. (Advanced
KML will allow the balloon to have links to the previous/next
features, etc.) It's always seemed somewhat wrong that we do that.

On Wed, Aug 27, 2008 at 11:14 AM, Rushforth, Peter <prushfor at nrcan.gc.ca> wrote:
> Hi,
> In the KML 2.2 schema, the kml:description element is of type xs:string.
> You can put html or xhtml markup in the kml:description element, and earth browsers
> will display it formatted according to markup.
> In order to put (ill-formed) html markup in the description element, you need to enclose it
> in a CDATA section.
> >From the XML spec:
> Definition: CDATA sections may occur anywhere character data may occur;
> they are used to escape blocks of text containing characters which would
> otherwise be recognized as markup.
> Shouldn't the type of kml:description be xs:anyType, which still would allow
> string values, but would also permit well-formed markup without having
> to escape the markup or enclose it in CDATA?
> Maybe I'm wrong somewhere here.
> Cheers,
> Peter Rushforth
> Technology Advisor / Conseiller technique
> GeoConnections / GéoConnexions
> 650-615 Booth St. / rue Booth
> Ottawa ON K1A 0E9
> E-mail / Courriel: Peter.Rushforth at NRCan.gc.ca
> Phone / Télephone: (613) 943-0784
> Fax / telecopier:  (613) 947-2410
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