Re: XMLDocument (SQL/XML X030)

Hi

On 24.01.25 17:18, Chapman Flack wrote:
> Or even: ... An XML Query "document node" is a relaxed version
> of XML document structure that corresponds exactly to what
> PostgreSQL's one XML type is already allowed to contain, so
> any non-null PostgreSQL XML value can be returned unchanged.
> More-permissive XML types some systems offer may hold values
> that are not so structured.

I think this version is much clearer and contains all the points that
were mentioned by Pavel earlier in this thread. Thanks for that!

I made some minor adjustments and added in v5 (attached)

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The <function>xmldocument</function> function returns the input argument
unchanged, or <literal>NULL</literal> if the argument is
<literal>NULL</literal>, and is provided for compatibility.

In the XML Query standard, a "document node" represents a relaxed
version of an XML document structure. This corresponds to what
PostgreSQL's single XML type allows, meaning that any valid non-null
PostgreSQL XML value can be returned unchanged. Other systems may
support more permissive XML data types, such as
<literal>XML(SEQUENCE)</literal>, which allow values that do not conform
to this structure. In PostgreSQL, every valid non-null value of the XML
type already has that structure, making any additional processing by
this function unnecessary.

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Is it ok like this?

Best regards, Jim