If you want to put the YAML code inside a YAML document, you need to process it as a string:
url: "src: test username: admin"
If you need a multi-line string, you can do
mvnforum: name: mvnforum abstraction_type: SVN url: " src: test\n username: admin\n " sourcepath: mvnforum/src/ webroot: codesecure_project: mvnforum
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