Update cheatsheets

xml-validate

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# xml validate
+
+> Validate XML documents.
+> More information: <http://xmlstar.sourceforge.net/docs.php>.
+
+- Validate one or more XML documents for well-formedness only:
+
+`xml validate {{path/to/input1.xml|URI}} {{input2.xml ...}}`
+
+- Validate one or more XML documents against a Document Type Definition (DTD):
+
+`xml validate --dtd {{path/to/schema.dtd}} {{path/to/input1.xml|URI}} {{input2.xml ...}}`
+
+- Validate one or more XML documents against an XML Schema Definition (XSD):
+
+`xml validate --xsd {{path/to/schema.xsd}} {{path/to/input1.xml|URI}} {{input2.xml ...}}`
+
+- Validate one or more XML documents against a Relax NG schema (RNG):
+
+`xml validate --relaxng {{path/to/schema.rng}} {{path/to/input1.xml|URI}} {{input2.xml ...}}`
+
+- Display help:
+
+`xml validate --help`