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Re: New XML section for documentation

From: Bruce Momjian <bruce(at)momjian(dot)us>
To: Peter Eisentraut <peter_e(at)gmx(dot)net>
Cc: PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>, PostgreSQL-documentation <pgsql-docs(at)postgresql(dot)org>
Subject: Re: New XML section for documentation
Date: 2006-08-26 16:20:49
Message-ID: 200608261620.k7QGKn729150@momjian.us (view raw or flat)
Thread:
Lists: pgsql-docspgsql-hackers
Peter Eisentraut wrote:
> Bruce Momjian wrote:
> > XML Document Support
> > ====================
> > XML support is not one capability, but a variety of features
> > supported by a database.
> 
> database system

Done.

> > Storage
> > -------
> > PostgreSQL stores XML documents as ordinary text documents.
> 
> It is "possible" to do that, but this sounds like it's done 
> automatically or implicitly.  Maybe:
> 
> "PostgreSQL does not have a specialized XML data type.  The recommended 
> way is to store XML documents as text."

Clarified.

> > Import/Export
> > -------------
> > Because XML documents are stored as normal text documents, they can
> > be imported/exported with little complexity.
> 
> Import/export refers to exporting schema data with XML decorations.  Of 
> course you can export column data trivially, but that's not what this 
> is about.

OK, section redone.

> > Validation
> > ----------
> > /contrib/xml2 has a function called xml_valid() that can be used in
> > a CHECK constraint to enforce that a field contains valid XML.  It
> > does not support validation against a specific XML schema.
> 
> Then this is not validation but only checking for well-formedness.  The 
> xml2 README says so, in fact.

I made it clear in the section that the XML syntax was being checked,
not validation against a schema.  You want Check and Validation
sections?

> > Indexing
> > --------
> 
> I think the expression index capability combined with contrib/xml2 is 
> more relevant here than the full-text search capability.

Agreed, added.

> > Transforming
> > ------------
> > /contrib/xml2 supports XSL transformations.
> 
> That's XSLT.

OK.

> > XML to SQL Mapping
> > -------------------
> > This involves converting XML data to and from relational structures.
> > PostgreSQL has no internal support for such mapping, and relies on
> > external tools to do such conversions.
> 
> Are there instances of such tools?

Well, it seems EMS has a product that does it, and I assume other XML
tools have database interfaces.  Also, psql can do it if you want to
convert XHTML to XML, so I mentioned that too.

-- 
  Bruce Momjian   bruce(at)momjian(dot)us
  EnterpriseDB    http://www.enterprisedb.com

  + If your life is a hard drive, Christ can be your backup. +

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