XOM API for Processing XML with Java

[John Cowan <jcowan AT reutershealth.com>]

Michael McEniry scripsit:

> A base URI is scoped to an Element (and Document). The=20
> value of a base URI predominantly used to qualify the=20
> value of a (link) Attribute. Add these methods to=20
> ParentNode, to cover Element and Document, and to=20
> Attribute. It doesn't make sense for the various=20
> LeafNode types to contain these methods.

I agree that setBaseURI belongs in ParentNode only, but
getBaseURI belongs to Node.  For example, if you have a
relative URI in a PI, it should be possible to ask
what the base URI is without navigating.

Note that to do this right, it is now necessary to notice
when a new external entity has been entered (you can
hook EntityResolver to do this), since that changes
the base URI.  Indeed, one of the purposes of xml:base is
to capture this change when reducing multi-entity documents
to a single entity.

Internal entities do not affect the base, fortunately.

-- 
John Cowan    http://www.ccil.org/~cowan   <jcowan AT reutershealth.com>
    "Any legal document draws most of its meaning from context. A telegram
    that says 'SELL HUNDRED THOUSAND SHARES IBM SHORT' (only 190 bits in
    5-bit Baudot code plus appropriate headers) is as good a legal document
    as any, even sans digital signature." --me