Groovy
Retrieve the first object (index [0]) among all objects attached to this page and class XWikiComments
com.xpn.xwiki.api.Object@763c612
Retrieve all objects attached to this page and of class XWikiComments
[com.xpn.xwiki.api.Object@480ed13a, com.xpn.xwiki.api.Object@44ca5bcb, com.xpn.xwiki.api.Object@41508fb5, com.xpn.xwiki.api.Object@100ad593, com.xpn.xwiki.api.Object@374bae1f, com.xpn.xwiki.api.Object@49949195, com.xpn.xwiki.api.Object@38e1f2f0, com.xpn.xwiki.api.Object@7a1487bc, com.xpn.xwiki.api.Object@59db8641]
Retrieve all objects attached to this page and of class XWikiComments and one of their properties
objsAuthors = doc.getObjects('XWiki.XWikiComments').author
objsAuthor = doc.getObjects('XWiki.XWikiComments')[2].author
println objs[0].author
println objsAuthors
println objsAuthor