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https://wiki.postgresql.org/wiki/XML_Support
Aug 25, 2010 · These would serve as PostgreSQL input/output functions, with some syntax wrappers around it to support the standard syntax. An xml datum can contain one of two sorts of values: a document or a fragment. A document contains a header, a root element, and all the other things that make a well-formed XML document.
https://www.postgresql.org/docs/8.2/datatype-xml.html
PostgreSQL does not have a specialized XML data type. Users should store XML documents in ordinary TEXT fields. If you need the document split apart into its component parts so each element is stored separately, you must use a middle-ware solution to do that, but once done, the data becomes relational and has to be processed accordingly.
https://www.postgresql.org/docs/9.3/datatype-xml.html
Needless to say, processing XML data with PostgreSQL will be less error-prone and more efficient if the XML data encoding, client encoding, and server encoding are the same. Since XML data is internally processed in UTF-8, computations will be most efficient if the server encoding is also UTF-8.
https://grokbase.com/t/postgresql/pgsql-general/068qsv52xb/xpath-and-xml-support
Aug 23, 2006 · (5 replies) I'm doing a performance and scalability test project for a PostgreSQL user who is working with geospatial data. The data is in GML form. For instance: 7.0,9.0 I installed PostGIS and it supports Point and coordinates very well. I an not sure what I should do with the XML content using PostgreSQL?
https://www.w3resource.com/PostgreSQL/postgresql-xml-functions.php
Though it does not have any effect in PostgreSQL, it is included for the conformity to the SQL standard. The first BY REF is required but the second one is optional. Since PostgreSQL currently supports XPath(which is a subset of xQuery) only, despite SQL standards say that it must use XQuery, XPath is used. xml_is_well_formed() function
https://www.postgresql.org/docs/11/functions-xml.html
If a column's XPath expression returns a non-XML value (limited to string, boolean, or double in XPath 1.0) and the column has a PostgreSQL type other than xml, the column will be set as if by assigning the value's string representation to the PostgreSQL type.
https://www.postgresql.org/docs/9.1/functions-xml.html
To process values of data type xml, PostgreSQL offers the functions xpath and xpath_exists, which evaluate XPath 1.0 expressions. xpath ( xpath , xml [ , nsarray ]) The function xpath evaluates the XPath expression xpath (a text value) against the XML value xml .
https://www.postgresql.org/docs/10/features.html
PostgreSQL supports most of the major features of SQL:2011. Out of 179 mandatory features required for full Core conformance, PostgreSQL conforms to at least 160. In addition, there is a long list of supported optional features.
https://www.postgresql.org/support/
PostgreSQL has a wide variety of community and commercial support options available for users, including: 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 …
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