From lojban+bncCLr6ktCfBBDulrDnBBoEjpPx-A@googlegroups.com Tue Nov 23 10:44:17 2010 Received: from mail-pw0-f61.google.com ([209.85.160.61]) by chain.digitalkingdom.org with esmtp (Exim 4.72) (envelope-from ) id 1PKxqb-00042N-As; Tue, 23 Nov 2010 10:44:17 -0800 Received: by pwi2 with SMTP id 2sf713517pwi.16 for ; Tue, 23 Nov 2010 10:44:03 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=googlegroups.com; s=beta; h=domainkey-signature:received:x-beenthere:received:received:received :received:received-spf:received:received:received:date:from:to :subject:message-id:mail-followup-to:mime-version:x-original-sender :x-original-authentication-results:reply-to:precedence:mailing-list :list-id:list-post:list-help:list-archive:sender:list-subscribe :list-unsubscribe:content-type:content-disposition; bh=fMf1nym7L1iPY2FvuecKCobpF9AGLqVm/ENVy6+WSQM=; b=YqrBs/UHlkhoETs/R9L4v8QWUaQrJ7okr955CDR5nQ0rZFLn2Y1KPQjLRXfm4UJRXl zjiKMe/1DGeJDIKLXxWWY3TQKEXyQzOnk8Vc+H3S0R3SJ2CRjT8feJNPEa0wrDBdW/C8 FZOWe+DW2Qe6B9WXo4twEvITld9hOx6coFxmI= DomainKey-Signature: a=rsa-sha1; c=nofws; d=googlegroups.com; s=beta; h=x-beenthere:received-spf:date:from:to:subject:message-id :mail-followup-to:mime-version:x-original-sender :x-original-authentication-results:reply-to:precedence:mailing-list :list-id:list-post:list-help:list-archive:sender:list-subscribe :list-unsubscribe:content-type:content-disposition; b=phBltLYEFU6XAAjuC6AJ0cqD8NQGMUOEa6CWm/mWi/d1Bhw0WDyD450f7P2Yh04sN+ Xb8GI/K9NjI+dD6nXCu91bCZnSMqh+TB5johQmO5yeA15Aa6IAqiwS0lnxMWtRY+9+wI aYdFZ7OkXbpJlrQiqTL1KvUSS7vATMBt7U+TQ= Received: by 10.142.208.5 with SMTP id f5mr393807wfg.39.1290537838221; Tue, 23 Nov 2010 10:43:58 -0800 (PST) X-BeenThere: lojban@googlegroups.com Received: by 10.142.6.9 with SMTP id 9ls159460wff.3.p; Tue, 23 Nov 2010 10:43:57 -0800 (PST) Received: by 10.142.44.21 with SMTP id r21mr4841919wfr.56.1290537837097; Tue, 23 Nov 2010 10:43:57 -0800 (PST) Received: by 10.142.44.21 with SMTP id r21mr4841918wfr.56.1290537837073; Tue, 23 Nov 2010 10:43:57 -0800 (PST) Received: from mail-pw0-f41.google.com (mail-pw0-f41.google.com [209.85.160.41]) by gmr-mx.google.com with ESMTP id p40si9411748wfc.2.2010.11.23.10.43.56; Tue, 23 Nov 2010 10:43:56 -0800 (PST) Received-SPF: neutral (google.com: 209.85.160.41 is neither permitted nor denied by best guess record for domain of alanpost@sunflowerriver.org) client-ip=209.85.160.41; Received: by mail-pw0-f41.google.com with SMTP id 6so3007675pwi.0 for ; Tue, 23 Nov 2010 10:43:56 -0800 (PST) Received: by 10.142.213.11 with SMTP id l11mr7154176wfg.278.1290537836454; Tue, 23 Nov 2010 10:43:56 -0800 (PST) Received: from sunflowerriver.org (c-68-35-167-179.hsd1.nm.comcast.net [68.35.167.179]) by mx.google.com with ESMTPS id w14sm8259008wfd.18.2010.11.23.10.43.54 (version=TLSv1/SSLv3 cipher=RC4-MD5); Tue, 23 Nov 2010 10:43:55 -0800 (PST) Date: Tue, 23 Nov 2010 11:43:52 -0700 From: ".alyn.post." To: Lojban List Subject: [lojban] rp-expression-tail ordered choice with empty grouping Message-ID: <20101123184352.GE10838@alice.local> Mail-Followup-To: Lojban List Mime-Version: 1.0 X-Original-Sender: alyn.post@lodockikumazvati.org X-Original-Authentication-Results: gmr-mx.google.com; spf=neutral (google.com: 209.85.160.41 is neither permitted nor denied by best guess record for domain of alanpost@sunflowerriver.org) smtp.mail=alanpost@sunflowerriver.org Reply-To: lojban@googlegroups.com Precedence: list Mailing-list: list lojban@googlegroups.com; contact lojban+owners@googlegroups.com List-ID: List-Post: , List-Help: , List-Archive: Sender: lojban@googlegroups.com List-Subscribe: , List-Unsubscribe: , Content-Type: text/plain; charset=ISO-8859-1 Content-Disposition: inline What does the following production in the lojban grammar mean?: rp-expression-tail <- rp-expression operator rp-expression-tail / () Do I understand that to mean 'the sequence of rp-expression, operator, and rp-expression-tail OR nothing?' Could the above also be expressed: rp-expression-tail <- (rp-expression operator rp-expression-tail)? And if so, why the odd way of specifying it? I'm weak on pitfalls of recursive behavior in grammars, am I looking at a workaround related to that? -Alan -- .i ko djuno fi le do sevzi -- You received this message because you are subscribed to the Google Groups "lojban" group. To post to this group, send email to lojban@googlegroups.com. To unsubscribe from this group, send email to lojban+unsubscribe@googlegroups.com. For more options, visit this group at http://groups.google.com/group/lojban?hl=en.