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https://wiki.postgresql.org/wiki/XML_Support
Aug 25, 2010 · You should start with the PostgreSQL XML Data Type and PostgreSQL XML Functions documentation in the manual when getting started with PostgreSQL's XML support. This page discusses the planning of that work, which is now largely complete, rendering the following obsolete.
https://www.postgresql.org/docs/9.1/functions-xml.html
9.14.1. Producing XML Content. A set of functions and function-like expressions are available for producing XML content from SQL data. As such, they are particularly suitable for formatting query results into XML documents for processing in client applications.
https://www.postgresql.org/docs/8.2/datatype-xml.html
8.14. XML Document Support. XML (Extensible Markup Language) support is not one capability, but a variety of features supported by a database system. These capabilities include storage, import/export, validation, indexing, efficiency of modification, searching, transforming, and XML to SQL mapping. PostgreSQL supports some but not all of these XML capabilities.
https://www.postgresql.org/docs/9.3/datatype-xml.html
The xml type does not validate input values against a document type declaration (DTD), even when the input value specifies a DTD. There is also currently no built-in support for validating against other XML schema languages such as XML Schema. The inverse operation, producing a character string value from xml, uses the function xmlserialize:
https://www.w3resource.com/PostgreSQL/postgresql-xml-functions.php
Instead of returning the individual XML values that satisfy the XPath, this function returns a Boolean indicating whether the query was satisfied or not. This function is equivalent to the standard XMLEXISTS predicate, except that it also offers support for a namespace mapping argument. Syntax: xpath_exists(xpath, xml [, nsarray]) Example. Code:
https://www.postgresql.org/docs/current/functions-xml.html
The functions and function-like expressions described in this section operate on values of type xml.See Section 8.13 for information about the xml type. The function-like expressions xmlparse and xmlserialize for converting to and from type xml are documented there, not in this section.. Use of most of these functions requires PostgreSQL to have been built with configure --with-libxml.
https://www.postgresql.org/support/
Support . PostgreSQL has a wide variety of community and commercial support options available for users, including: Documentation; The Community section, which details the support options available to users from the PostgreSQL community; Mailing Lists
https://www.researchgate.net/publication/221636717_XML_support_in_PostgreSQL
XML support in PostgreSQL. ... whose central idea is to take advantage of effective XML node numbering scheme to support XML data model over relational table. Firstly, this relational table of XML ...
https://www.2ndquadrant.com/en/blog/xmltable-intro/
Mar 08, 2017 · I just committed a patch by Pavel Stěhule that adds the XMLTABLE functionality to PostgreSQL 10. XMLTABLE is a very useful feature dictated by the SQL/XML standard, that lets you turn your XML data into relational form, so that you can mix it with the rest of your relational data. This feature has many uses; keep reading for some details on it. ...
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