#125 Allow val to read from stdin

[Ernst de Haan]

Please allow xmlstarlet val to read from stdin.

This is especially useful in scenarios where an XML file is generated by some other tool, or wherexmlstarlet is running inside a container and cannot access the file system directly.

Steps to reproduce:

1. Have a valid XML file in the file a.xml.
2. Have a valid XML Schema definition in the file b.xsd.
3. Execute cat a.xml | xmlstarlet val --xsd b.xsd --err

Expected results:

1. On step 3, the XML file should be validated against the XSD.

Actual results:

1. NOK: On step 3, this error is generated:

couldn't read file '--err'
--err - invalid

[Ernst de Haan]

Workaround I'm using (inside a Dockerfile):

mkdir -p /io
cat > /io/input.xml
xmlstarlet validate --xsd "$1" --err /io/input.xml

[Noam Postavsky]

Use - to indicate stdin, e.g., cat a.xml | xmlstarlet val --xsd b.xsd --err -

[Ernst de Haan]

Thanks Noam! That works.

Would be good to explain that in the help output.

I think this ticket can be closed now.