yq/pkg/yqlib/doc/usage/xml.md
Mike Farah 3c7ccf0bc4 wip
2022-01-02 13:44:31 +11:00

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# XML
Encode and decode to and from XML. Whitespace is not conserved for round trips - but the order of the fields are.
As yaml does not have the concept of attributes, xml attributes are converted to regular fields with a prefix to prevent clobbering. This defaults to "+", use the `--xml-attribute-prefix` to change.
Consecutive xml nodes with the same name are assumed to be arrays.
All values in XML are assumed to be strings - but you can use `from_yaml` to parse them into their correct types:
```
yq e -p=xml '.myNumberField |= from_yaml' my.xml
```
XML nodes that have attributes then plain content, e.g:
```xml
<cat name="tiger">meow</cat>
```
The content of the node will be set as a field in the map with the key "+content". Use the `--xml-content-name` flag to change this.
## Round trip: with comments
A best effort is made, but comment positions and white space are not preserved perfectly.
Given a sample.xml file of:
```xml
<!-- before cat -->
<cat>
<!-- in cat before -->
<x>3<!-- multi
line comment
for x --></x>
<!-- before y -->
<y>
<!-- in y before -->
<d><!-- in d before -->z<!-- in d after --></d>
<!-- in y after -->
</y>
<!-- in_cat_after -->
</cat>
<!-- after cat -->
```
then
```bash
yq e -p=xml '.' sample.xml
```
will output
```yaml
# before cat
cat:
# in cat before
x: "3" # multi
# line comment
# for x
y:
# in y before
# in d before
d: z # in d after
# in y after
# before y in_cat_after
# after cat
```