golang标准库encoding/xml解析格式
The name for the XML elements is taken from, in order of preference:
- the tag on the XMLName field, if the data is a struct
- the value of the XMLName field of type Name
- the tag of the struct field used to obtain the data
- the name of the struct field used to obtain the data
- the name of the marshaled type
The XML element for a struct contains marshaled elements for each of the exported fields of the struct, with these exceptions:
- the XMLName field, described above, is omitted.
- a field with tag "-" is omitted.
- a field with tag "name,attr" becomes an attribute with the given name in the XML element.
- a field with tag ",attr" becomes an attribute with the field name in the XML element.
- a field with tag ",chardata" is written as character data, not as an XML element.
- a field with tag ",cdata" is written as character data wrapped in one or more <![CDATA[ ... ]]> tags, not as an XML element.
- a field with tag ",innerxml" is written verbatim, not subject to the usual marshaling procedure.
- a field with tag ",comment" is written as an XML comment, not subject to the usual marshaling procedure. It must not contain the "--" string within it.
- a field with a tag including the "omitempty" option is omitted if the field value is empty. The empty values are false, 0, any nil pointer or interface value, and any array, slice, map, or string of length zero.
- an anonymous struct field is handled as if the fields of its value were part of the outer struct.
- a field implementing Marshaler is written by calling its MarshalXML method.
- a field implementing encoding.TextMarshaler is written by encoding the result of its MarshalText method as text.
If a field uses a tag "a>b>c", then the element c will be nested inside parent elements a and b. Fields that appear next to each other that name the same parent will be enclosed in one XML element.
If the XML name for a struct field is defined by both the field tag and the struct's XMLName field, the names must match.
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