EPSG:4974

GEOCCS["SIRGAS 1995",DATUM["D_SIRGAS",SPHEROID["GRS_1980",6378137,298.257222101]],PRIMEM["Greenwich",0],UNIT["Meter",1]]

+proj=geocent +ellps=GRS80 +units=m +no_defs 

proj4.defs("EPSG:4974","+proj=geocent +ellps=GRS80 +units=m +no_defs");

<?xml version="1.0" encoding="UTF-8"?>
 <gml:GeodeticCRS xmlns:epsg="urn:x-ogp:spec:schema-xsd:EPSG:1.0:dataset" xmlns:gml="http://www.opengis.net/gml/3.2" xmlns:xlink="http://www.w3.org/1999/xlink" gml:id="iogp-crs-4974">
  <gml:metaDataProperty>
    <epsg:CommonMetaData>
      <epsg:type>geocentric</epsg:type>
      <epsg:alias alias="SIRGAS" code="2383" codeSpace="urn:ogc:def:naming-system:EPSG::7301" />
      <epsg:alias alias="278" code="5429" codeSpace="urn:ogc:def:naming-system:EPSG::1046" />
      <epsg:alias alias="SIRGAS95 - XYZ" code="7324" codeSpace="urn:ogc:def:naming-system:EPSG::1047" />
      <epsg:informationSource>IBGE Brazil, http://www1.ibge.gov.br/</epsg:informationSource>
      <epsg:revisionDate>2019-07-17</epsg:revisionDate>
      <epsg:changes>
        <epsg:changeID xlink:href="urn:ogc:def:change-request:EPSG::2004.250" />
        <epsg:changeID xlink:href="urn:ogc:def:change-request:EPSG::2005.460" />
        <epsg:changeID xlink:href="urn:ogc:def:change-request:EPSG::2006.465" />
        <epsg:changeID xlink:href="urn:ogc:def:change-request:EPSG::2019.020" />
      </epsg:changes>
      <epsg:show>true</epsg:show>
      <epsg:isDeprecated>false</epsg:isDeprecated>
    </epsg:CommonMetaData>
  </gml:metaDataProperty>
  <gml:identifier codeSpace="IOGP">urn:ogc:def:crs:EPSG::4974</gml:identifier>
  <gml:name>SIRGAS 1995</gml:name>
  <gml:remarks>Replaced by SIRGAS 2000 (CRS code 4988).</gml:remarks>
  <gml:domainOfValidity xlink:href="urn:ogc:def:area:EPSG::3448" />
  <gml:scope>Geodetic survey.</gml:scope>
  <gml:cartesianCS xlink:href="urn:ogc:def:cs:EPSG::6500" />
  <gml:geodeticDatum xlink:href="urn:ogc:def:datum:EPSG::6170" />
</gml:GeodeticCRS>

4974=GEOCCS["SIRGAS 1995",DATUM["Sistema_de_Referencia_Geocentrico_para_America_del_Sur_1995",SPHEROID["GRS 1980",6378137,298.257222101,AUTHORITY["EPSG","7019"]],AUTHORITY["EPSG","6170"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Geocentric X",OTHER],AXIS["Geocentric Y",OTHER],AXIS["Geocentric Z",NORTH],AUTHORITY["EPSG","4974"]]

PROJECTION
	"proj=geocent"
	"ellps=GRS80"
	"units=m"
	"no_defs"
END

<?xml version="1.0" encoding="utf-8"?>
<Map srs="+proj=geocent +ellps=GRS80 +units=m +no_defs">
	<Layer srs="+proj=geocent +ellps=GRS80 +units=m +no_defs">
	</Layer>
</Map>

INSERT into spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext) values ( 4974, 'EPSG', 4974, '+proj=geocent +ellps=GRS80 +units=m +no_defs ', 'GEOCCS["SIRGAS 1995",DATUM["Sistema_de_Referencia_Geocentrico_para_America_del_Sur_1995",SPHEROID["GRS 1980",6378137,298.257222101,AUTHORITY["EPSG","7019"]],AUTHORITY["EPSG","6170"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Geocentric X",OTHER],AXIS["Geocentric Y",OTHER],AXIS["Geocentric Z",NORTH],AUTHORITY["EPSG","4974"]]');

GEOCCS["SIRGAS 1995",DATUM["Sistema_de_Referencia_Geocentrico_para_America_del_Sur_1995",SPHEROID["GRS 1980",6378137,298.257222101,AUTHORITY["EPSG","7019"]],AUTHORITY["EPSG","6170"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Geocentric X",OTHER],AXIS["Geocentric Y",OTHER],AXIS["Geocentric Z",NORTH],AUTHORITY["EPSG","4974"]]