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so in order to have a basis for the rest of this class it's important to talk about the parts of a Marc record there are four different parts of a Marc record record structure and the data content are basically parts that the cataloger doesn't have to worry about too much there are things that the computer uses to interpret the record the content designation is what we're mostly going to focus focus on and content business is the stuff in the record basically the stuff that tells the computer what is in each area of the record and there are two different types of content designation the variable fields and the fixed fields in this video we are going to talk about the variable fields these fields contain specific pieces of information generally they're pretty much free text where the cataloger creates what's put into them you know to choose from a predetermined set of options and the variable fields contain four different pieces of content that we'll talk about they're identified by tags indicators delimiter and subfield codes tags are three-digit numbers that you'll see at the beginning of each line in a Marc record tags basically tell the computer what type of information is in each field and I should back up a sec and say that a field is basically a piece of information in the record I've been using that word without defining it and basically it's just one chunk of information in the record so the tag is tell a computer how to interpret each field so for example the 245 tag is helping computer that this is a title and statement of responsibility so you can see right there that 245 is called a tag in this instance the next piece of variable content are indicators and they are digits or blanks that give the computer kind of extra information about how to deal with the data contained in the field the tag tells the computer generally what the information is but some tags have indicators that are defined to tell the computer how to deal with this for example there are two indicators of 1 and 0 for this particular 245 field and we will talk about this in more detail in the coming weeks but the first one the indicator one tells the computer that there is an author main entry for this record and the second indicator is a zero and that's helping a furor that you don't need to skip any characters at the beginning if there is an a an or the article at the beginning of the title then the computer would need to skip those characters in order to alphabetize the pilot correctly but in this case it doesn't need to give anything so the second indicator is a zero one thing I wanted to point out is that generally when you're referring to indicators they're mentioned separately so you'll say that this has the indicators of one zero it doesn't say ten just wanted to point that out the next piece of content designation we're going to talk about our de limiters and they basically tell the computer where each subfield starts now a subfield is a smaller piece of information within a field so for example here in this field we have a title we have a subtitle and then we have the author's name in the statement responsibilities and each of those are a smaller piece of information and they go in a subfield the limiters are basically symbols the telecommuters where each subfield starts you can see different symbols dollar signs pound signs the double daggers for example in this class we're going to use the dollar sign to represent a delimiter and then after a delimiter you'll see a subfield code and this indicates what type of information is in a subfield so for example in this 245 field subfield a is the title proper so if you'll be is the remainder of the title basically in this case a subtitle and then C is the statement of responsibility in this case the author's name so those codes are important to the computer they tell the computer what smaller piece of information is contained in each subfield to make up this 245 field in the resource handout that is at the top of the course webpage you will see a link to the OCLC bibliographic formats and standards and I highly recommend consulting that as a place for information about the tags as you go through this course you will see that all the subfields are listed here and some of them have are after them and some of them have NR after them the ones with R means that they're repeatable you can use them more than once within a given field the ones with n R means that they are not repeatable one thing to notice about mark tags is that they are organized by hundreds basically and sometimes when you hear catalogers talk they're shorthand will be kind of they'll talk about the 1xx fields or the 6xx field and basically any tags that all start with the same first number they're roughly used for a similar purpose they are you know one of these main categories here another way to think about mark tags when you're looking at them is that tags that end with the same two numbers have the same type of content this is called parallel content and so if you see a tag that ends with 0 0 whether it's a 100 or a 600 or 700 you know that's going to be a person's name if you see a tag that ends with a 1 0 whether it's a 110 a 6 10 or 710 that's going to be a corporate name and we're going to talk about all these more detail later so don't worry about that but this is the concept of parallel content this also applies to subject headings anything it ends with a 5 0 as a topical term for example or anything it ends with a 5 1 is a geographic term so their organization by hundreds and the concept of peril of content are two ways of thinking about the organization of marked tags