On 11/15/2011 01:39 PM, Christophe Strobbe wrote:
At 09:59 4-11-2011, Stephan Bergmann wrote:
Each .oxt extension can carry any number of dependencies, specifying
conditions that need to be met by the hosting LO installation for the
extension to be successfully deployable (see
<http://wiki.services.openoffice.org/wiki/Documentation/DevGuide/Extensions/Dependencies>).


This page links to <http://openoffice.org/extensions/description/2006>,
which returns an ERROR 404, so even if an extension developer wanted to
document more detailed dependencies, they would not know what syntax or
elements to use in their description.xml file.

"http://openoffice.org/extensions/description/2006"; is only used as an XML namespace name on that page. URLs used as XML namespace names are not generally expected to be dereferencable (and are often not). (That the wiki software used for that page displays that string as a browsable link appears to be an unfortunate mis-feature.)

The general syntax for dependencies within description.xml is described on that page, in the second-last paragraph (that also contains the mis-links). For the description of individual dependencies, follow the link to <http://wiki.services.openoffice.org/wiki/Documentation/DevGuide/Extensions/Description_of_XML_Elements#Element_.2Fdescription.2Fdependencies> labelled "XML description for description.xml" in the "See also" section at the bottom of the page. (And for the description of individual dependencies relative to LO instead of OOo, <https://wiki.documentfoundation.org/Development/Extension_Development> is the new starting point.)

I was confronted with this problem just today because a new Java-based
extension cannot be installed on some Ubuntu systems even though it
installs without problems on Windows and some other Ubuntu systems.
The extension manager displayed the following error dialog:
(com.sun.star.deployment.DeploymentException) { { Message = "An error
occurred while enabling: accessodf-addon.jar", Context =
(com.sun.star.uno.XInterface) @a403870 }, Cause = (any) {
(com.sun.star.registry.CannotRegisterImplementationException) {{ Message
= "", Context = (com.sun.star.uno.XInterface)} @0 } } } }

It turns out that this issue can be solved with
sudo apt-get install libreoffice-java-common

So I thought about how to document that dependency in description.xml,
but I couldn't ... (And libreoffice-java-common or
openoffice.org-java-common may be rather broad.)

Yes, extension dependencies are currently only able to express dependencies on a complete LO installation. Dependencies that are not fulfilled because only a subset of LO functionality is installed are not supported. (And note that what those available subsets are is typically also specific to each LO distribution, even if the optional module structure in scp2 sets some common ground.)

Stephan
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