Ted,
There has to be some reason why Margaret did not marry Sydney Woodland, why she did not register the birth of Sydney Walter Woodland when he was born about 1892, and why Ada's birth was registered as illegitimate. The likely reason is that either Sydney Woodland or Margaret were already married. As Margaret's first 4 children to Michael Moore were all registered as legitimate births with full details of the father it strongly suggests that Margaret was already married to Michael Moore, and that this is the reason why she could not marry Sydney Woodland.
The index for Ada's birth, with no father being named in the index, clearly shows that Ada's birth was considered to be illegitimate by the registrar who recorded the details:
Corbett, Ada Woodland Father: Corbett
Mother: Margt Corben(sic)
1894
Cranborne
#19835R
Moore, Ada WoodlandFather: Moore
Mother: Margt Corbett
Cranborne
#19835R
The actual birth registration shows other clues that you may be able to use. This is because the birth registration gives a date and place for Margaret's marriage to Michael Moore.
When and where born: 28th May 1894
Langmarine
Shire of Cranborne
County of Mornington
Name and whether present of not: Ada Woodland
not present
(Note: no surnames recorded in this column)Sex: Female
Name & Profession of Father, Age & birthplace of Father: Illegitimate
When & where married, Issue Living & deceased (of this marriage): 8th January 1879, Sherwood
(Note: Just days before Margaret's 16th birthday)Cornelius 14
Richard 13
Mary 11
Maggie 9
(Note: Sydney Walter not listed as he is not a child of this marriage)THIS SECTION THEN CROSSED OUT AND WRITTEN ACROSS IT:
Cancelled, Illegitimate
Name and maiden surname of Mother, Age & birthplace of Mother: Margaret Moore nee Corbett
31 years, Sherwood
Signature, descriptive & address of Informant:Margaret Moore
mother
Somerville
after declaration made as by law required*
Witness of birth: Mrs Wiltshire
When & where registered: 21st August 1894, Cranborne
Signature of Deputy Register: M Duff
acting registrar
*1st time I have ever seen this written, and it is not on the certificates above of below. I am guessing that Margaret wanted to have Ada's birth registered with Sydney Woodland shown as the father and that the registrar would not allow this, but did allow Ada to have the name Woodland registered as one of the first names.I was not expecting to find details of the marriage to Michael Moore on Ada's birth registration as it shouldn't have been recorded there. (I was going to suggest that you purchase Cornelius's 1880 birth registration to get marriage details, but now you won't have to.) The place called Sherwood appears to be a place that was called either Sherwood or Sherwood Park (unless Sherwood Park refered only to the race track at Sherwood - see following) and from street names existing to day appears to have been near Cranborne. All I have been able to find out for sure is that a town named Sherwood did exist in Victoria, and that they once held races there.
http://trove.nla.gov.au/ndp/del/article/70009706 (Apr 1877 - also mentions Sherwood Hotel)
http://trove.nla.gov.au/ndp/del/article/11566437 (1886 - refered to as Sherwood Park)
http://trove.nla.gov.au/ndp/del/article/70012721 (Apr 1891 - refered to as Sherwood)
http://trove.nla.gov.au/ndp/del/article/8512901 (Feb 1893 - refered to as Sherwood Park)
& many more references in between these dates to races at Sherwood or Sherwood Park
Not all marriages made it into the official records. Sometimes the minister forgot to send in the details. This appears to be one of those marriages. Your best bet woult be to track down the parish registers for all the churches in Sherwood in 1879 if you want to see the original record of the marriage. Perhaps another rootschatter can tell you if there is a way to do this.