[英]Namespaces in lxml
我想用lxml
包創建以下 XML:
<configuration xmlns:cond="http://www.aaa.com/orc/condition" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../schema/variation-config.xsd">
<strategy id="XXX">
<conditions>
<cond:scenario>A</cond:scenario>
</conditions>
</strategy>
</configuration>
到目前為止,我有以下代碼,完全不能令人滿意:
XHTML_NAMESPACE = "http://www.aaa.com/orc/condition"
XHTML = "{%s}" % XHTML_NAMESPACE
NSMAP = {
'cond' : XHTML_NAMESPACE,
'xsi': 'http://www.w3.org/2001/XMLSchema-instance'
}
root = etree.Element(
"configuration",
nsmap=NSMAP,
)
strategy = etree.SubElement(root, "strategy", id="XXX")
conditions = etree.SubElement(strategy, "conditions")
cond1 = etree.SubElement(conditions, XHTML + "scenario", nsmap=NSMAP)
cond1.text = "A"
它給了我:
<configuration xmlns:cond="http://www.aaa.com/orc/condition" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<strategy id="XXX">
<conditions>
<cond:scenario>A</cond:scenario>
</conditions>
</strategy>
</configuration>
題:
我只是想念xsi:noNamespaceSchemaLocation="../schema/variation-config.xsd"
。 你知道我如何將它添加到 XML 中嗎?
在使用更好的解決方案更新問題后,我認為您缺少一種為現有元素設置屬性的方法。 使用set
方法:
root.set(XSI + "noNamespaceSchemaLocation", "../schema/variation-config.xsd")
此外,當您向已經知道nsmap
定義的命名空間的元素添加子元素時,無需再次包含nsmap
。 換句話說,而不是
cond1 = etree.SubElement(conditions, XHTML + "scenario", nsmap=NSMAP)
你可以寫
cond1 = etree.SubElement(conditions, XHTML + "scenario")
最后, XHTML
是一個不幸的變量名,因為 XHTML 是一個標准命名空間。
產生正確結果的解決方案
from lxml import etree
COND_NAMESPACE = "http://www.aaa.com/orc/condition"
XSI_NAMESPACE = "http://www.w3.org/2001/XMLSchema-instance"
COND = "{%s}" % COND_NAMESPACE
XSI = "{%s}" % XSI_NAMESPACE
nsmap = {"cond": "http://www.aaa.com/orc/condition", "xsi": "http://www.w3.org/2001/XMLSchema-instance"}
root = etree.Element("configuration", nsmap=nsmap)
root.set(XSI + "noNamespaceSchemaLocation", "../schema/variation-config.xsd")
strategy = etree.SubElement(root, "strategy", id="XXX")
conditions = etree.SubElement(strategy, "conditions")
scenario = etree.SubElement(conditions, COND + "scenario")
scenario.text = "A"
print(etree.tostring(root, pretty_print=True))
輸出
<configuration xmlns:cond="http://www.aaa.com/orc/condition" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../schema/variation-config.xsd">
<strategy id="XXX">
<conditions>
<cond:scenario>A</cond:scenario>
</conditions>
</strategy>
</configuration>
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