Values of "true" (or "1") and "false" (or "0"). A date with the time of day and an optional time zone. While the time zone is optional, it is strongly advised that the zone always be specified in each date time value. A time zone conforming to the XSD:dateTime specification. It should be of the form "Z" or "shh.mm" where "s" is "+" or "-", "hh" is 00 to 23 and "mm" is 00 to 59. A calendar year (CCYY) in the gregorian calendar. A unitless quantity. This should not be confused with a dimensionless measure. The mnemonic of a log index curve plus the column index of the curve. The column index of the curve. Representation of a number as a double, possibly qualified as a ratio of doubles. Ratio component attributes 'numerator' and 'denominator' may be both present or both absent. When ratio component attributes are present, the ratio represented is to be used with the double representation included for human readability. A 'canonical' representation, according to the following rules, is suggested: Only use numerator/denominator when the representation of the number as double is not sufficiently precise (i. e. causes errors of accumulation). Express both numerator and denominator as integers (doubles with integer values) reduced to 'least common denominator' if possible. This defines a node in a hierarchical structure. The name of the element that the node represents. A space delimited list of names of sub-elements of the node which provides the human recognizable context for the node. This will typically be something like "name". The choice of which elements are used for keys is server dependent but it is suggested that all simplistic mandatory elements be included ("name" for most objects) plus most optional items of type timestamp or measuredDepthCoord. A server may provide more information than is required for "human" identication of a node. A server may also provide less information than is required for human identification but this is discuraged. A pointer to the node. This provides both the human context and the uid of the node. A " :: " delimited list of values representing the elements in keyName. If the element has attributes then the attribute values should be listed after the element value separated by spaces (e.g., "123 ft"). An array represented as the Base64-encoding of a sequence of binary representations of its elements. Points to the curveId that this data represents. An array represented by the sequence of double values of its elements. Points to the curveId that this data represents. A representation of a list of xsd:string values, restricted to strings without embedded whitespace. A representation of a list of xsd:double values. A reference to a name in another node of the xml hierachy. This value represents a foreign key from one element to another. A reference to the unique identifier (uid attribute) in the node referenced by the name value. A reference to a index value in another node of the xml hierachy. This value represents a foreign key from one element to another. A reference to the unique identifier (uid attribute) in the node referenced by the index value. A reference to an object (child node) within a wellbore. The wellbore may be defined within the context of another well. This value represents a foreign key from one node to another. The name of the rig with which there is a relationship. A pointer to the wellbore that contains the object. This is not needed unless the referenced object is outside the context of a common parent wellbore. A pointer to the object uid value. Data that represents a foreign key to a wellbore. The wellbore may be defined within the context of another well. The name of the wellbore with which there is a relationship. A pointer to the well that contains the wellbore. This is not needed unless the referenced wellbore is outside the context of a common parent well. A pointer to the wellbore uid value. The uidRef attribute. This is an attribute group to make it easier to profile uidRef as mandatory when the corresponding uid values are mandatory. This type should only be used where the ref attribute should be mandatory if the uid attributes are mandatory. This version has been profiled as required (i.e., it is more constrained). A pointer to the unique identifier of another element. This value should match the value of the uid attribute in the element that is being referenced. The uid attribute. This is in an attribute group to make it easier to profile uid as mandatory for all elements. This version has been profiled as required (i.e., it is more constrained). The unique identifier of the element. There should be no assumption as to the semantic content of this attribute. This should only be used with repeatable elements (i.e., maxOccurs="unbounded"). It is only required to be unique within the context of the nearest repeatable parent element. A user assigned human recognizable contexual name of something. There should be no assumption that (interoperable) semantic information will be extracted from the name by a third party. This type of value is generally not guaranteed to be unique and is not a candidate to be replaced by an enumeration. A comment or remark intended for human consumption. There should be no assumption that semantics can be extracted from this field by a computer. Neither should there be an assmumption that any two humans will interpret the information in the same way (i.e., it may not be interoperable). A textual description of something. A short textual description of something. An encoded value or values. The encoding may utilize any of several xsd encodings. Something external to the value must define the encoding. The uom attribute is optional because the value may be a string or unitless quantity. If the value is a measure then the uom must be specified. A single value. The encoding may utilize any of several xsd encodings. Something external to the value must define the encoding. A community assigned human recognizable name. This type of value is intended to be unique and is generally a candidate to be constrained to an enumerated list. A unit of measure acronym from the POSC unit of measure file. A locally unique identifier. The value is not intended to convey any semantic content (e.g., it may be computer generated). The value is only required to be unique within a context in a document (e.g., defined via key and keyref). There is no guarantee that the same data in multiple documents will utilize the same uid value unless enforced by the source of the document (e.g., a document server). A reference to the unique identifier of another element. This value represents a foreign key from one element to another. The value should match the value of an attribute of type uidString. The version of the schema. The first three levels are fixed. The fourth level can vary to represent on the constraints defined in enumerations and XML loader files. The name of something within a naming system. The naming system within the name is (hopefully) unique. The name of something within a mandatory naming system with an optional code. The naming system within the name is unique. A unique (short) code associated with the name. A textual string that retains all whitespace. IADC bearing wear code: integer 0 - 8 or one of the letters E, F, N or X. . A geodetic zone with values from 1 to 60 and a required direction of "N" (North) or "S" (South). For example, "21N". A measured depth coordinate in a wellbore. Positive moving from the reference datum toward the bottomhole. All coordinates with the same datum (and same uom) can be considered to be in the same Coordinate Reference System and are thus directly comparable. The unit of measure of the quantity value. A pointer to the reference datum for this coordinate value as defined in WellDatum. This value is assumed to match the uid value in a WellDatum. If not given then the default WellDatum must be assumed. The units of measure that are valid for measured depths in a wellbore. meter International Foot US Survey Foot A vertical (gravity based) depth coordinate within the context of a well. Positive moving downward from the reference datum. All coordinates with the same datum (and same uom) can be considered to be in the same Coordinate Reference System and are thus directly comparable. The unit of measure of the quantity value. A pointer to the reference datum for this coordinate value as defined in WellDatum. If not given then the default WellDatum must be assumed. A vertical (gravity based) elevation coordinate within the context of a well. Positive moving upward from the reference datum. All coordinates with the same datum (and same uom) can be considered to be in the same Coordinate Reference System and are thus directly comparable. The unit of measure of the quantity value. If not given then the default unit of measure of the explicitly or implicitly given datum must be assumed. A pointer to the reference datum for this coordinate value as defined in WellDatum. If not given then the default WellDatum must be assumed. The units of measure that are valid for vertical gravity based coordinates (i.e., elevation or vertical depth) within the context of a well. meter International Foot US Survey Foot British Foot 1865 A non-negative integer (zero based count or index) with a maximum vaulue of 32767 (2-bytes). For items that represent "number of" something or a "sequential" count or index. This value can be zero but cannot be negative. A positive integer (one based count or index). This value cannot be negative or zero. A large positive integer (one based count or index) with a maximum value of 2147483647 (4-bytes). This value cannot be negative or zero. A positive or negative count with a maximum positive value of 2147483647 (4-bytes). An estimate wind strength based on the Beaufort Wind Scale. Values range from 0 (calm) to 12 (hurricane). Pump Action: 1 = Single acting, 2 = double acting. IADC codes: 0 to 8. Integer level code from 1 through 5. Indexes things with the same name. That is the first one, the second one, etc.