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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/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.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/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.w3resource.com/PostgreSQL/postgresql-xml-functions.php
The particular behavior for individual data types is expected to evolve in order to align the SQL and PostgreSQL data types with the XML Schema specification, at which point a more precise description will appear. ... except that it also offers support for a namespace mapping argument. Syntax: xpath_exists(xpath, xml [, nsarray]) Example.
https://www.postgresql.org/docs/8.4/datatype-xml.html
XML Type. The xml data type can be used to store XML data. Its advantage over storing XML data in a text field is that it checks the input values for well-formedness, and there are support functions to perform type-safe operations on it; see Section 9.14.
https://www.postgresql.org/support/
Commercial support is also available from one of the many companies providing professional services to the PostgreSQL community. A list of companies that provide PostgreSQL-specific hosting is also available. Bug Reporting. Found a bug in PostgreSQL? Please read over our bug reporting guidelines and then report it using our bug reporting form.
https://wiki.postgresql.org/wiki/PostgreSQL_vs_SQL/XML_Standards
The data model and formal semantics of the redesigned languages are the terms used to specify the redesigned SQL/XML. SQL/XML support in PostgreSQL . PostgreSQL’s SQL/XML support follows the first, 2003 edition of the standard, with a few extensions …
https://www.educba.com/oracle-vs-postgresql/
Oracle vs PostgreSQL support data schemes, typing, XML support, secondary indexes, and SQL. Oracle supports different programming languages such as C/C++, ... Customer support for PostgreSQL is free but it will take time to resolve the issue as it will be solved by the developer’s community. We can opt for paid service by PostgreSQL ...
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