无法追加GML字符串中使用LXML在python

问题描述：

from lxml import etree 
import lxml 
xml_response = lxml.etree.Element('xmlResponse') 
mapping = lxml.etree.SubElement(xml_response,'mapping',{"id":"AHGJHKSHQWEIUELQWDKJQEDH"}) 
services_element = lxml.etree.SubElement(mapping, 'service_name') 
services_element.text = "gml_info" 
gml_info = '''<gml:Envelope srsName="EPSG:4326"> 
     <gml:lowerCorner>1 2</gml:lowerCorner> 
     <gml:upperCorner>10 20</gml:upperCorner> 
    </gml:Envelope>''' 
services_element = lxml.etree.SubElement(mapping, 'gml_info') 
services_element.text = gml_info 
print (etree.tostring(xml_response))

到XML时我尝试运行上面的代码我得到下面的响应，其中GML标签不会保留。

响应：

b'<xmlResponse><mapping id="AHGJHKSHQWEIUELQWDKJQEDH"> 
<service_name>gml_info</service_name> 
<gml_info>&lt;gml:Envelope 
srsName="EPSG:4326"&gt;\n\t\t&lt;gml:lowerCorner&gt;1 
2&lt;/gml:lowerCorner&gt;\n\t\t&lt;gml:upperCorner&gt;10 
20&lt;/gml:upperCorner&gt;\n\t&lt;/gml:Envelope&gt;</gml_info> 
</mapping></xmlResponse>'

答

你必须将其添加为xml子树而不是text node。

from lxml import etree 
import lxml 
import io 

xml_response = lxml.etree.Element('xmlResponse') 
mapping = lxml.etree.SubElement(xml_response, 'mapping', {"id": "AHGJHKSHQWEIUELQWDKJQEDH"}) 
services_element = lxml.etree.SubElement(mapping, 'service_name') 
services_element.text = "gml_info" 

gml = io.StringIO('''<root xmlns:gml="gml"><gml:Envelope srsName="EPSG:4326">\ 
<gml:lowerCorner>1 2</gml:lowerCorner>\ 
<gml:upperCorner>10 20</gml:upperCorner>\ 
</gml:Envelope></root>''') 
gml_info = etree.parse(gml).getroot() 


services_element = lxml.etree.SubElement(mapping, 'gml_info') 
services_element.extend(gml_info) 

print(etree.tostring(xml_response))

我不得不与命名空间声明添加<root xmlns:gml="gml">元素gml（你应该改变它为一个真正的链接）。没有它你会得到错误：

lxml.etree.XMLSyntaxError: Namespace prefix gml on Envelope is not defined, line 1, column 41

无法追加GML字符串中使用LXML在python

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