TAL's underlying TALES, the expression-engine of which TAL makes use of, doesn't support the mixing of expression-types in one expression. It's syntax allows only one expression-type to be specified (defaults to 'path', if omitted, btw), as no delimiter is provided (like a semicolon for chaining several TAL-statements in one element, e.g.).
But instead of mixing three expression-types you can use one python-expression, try:
python: view.show and context.portal_type()!='Document'
Update:
If you have customized a Plone's default-template via portal_view_customizations ('TTW'), now restricted python-methods cannot be accessed, that' why view/show
throws an error.
It returns the allowAnonymousViewAbout
-property of the site-properties, you can also check this condition yourself and your expression looks like:
tal:define="name user/getUserName"
tal:condition="python:test(name!='Anonymous User') and context.portal_type()!='Document';
Quick'n'dirty alternative:
Do it with CSS:
body.userrole-anonymous .documentByLine {display:none}
body:not(.template-document_view) .documentByLine {display:block}
This will render the hidden elements, but it's helpful for prototyping and such, or 'quickfixes' (no admin available, etc.).